Chapter 3 Ultrasound Physics

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  • 1/64 Questions

    What is the spped for soft tissue?

    • 1460 m/s
    • 1540 m/s
    • 1540
    • 3500 m/s
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About This Quiz

This quiz focuses on key concepts of Ultrasound Physics, assessing knowledge in areas like amplitude, frequency, and sound wave speed. It's designed to enhance understanding of ultrasound's technical aspects, suitable for students or professionals in physics or medical imaging.

Chapter 3 Ultrasound Physics - Quiz

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  • 2. 

    Whats is the unit for frequency

    • Pascals

    • Miles

    • Seconds

    • Hertz

    Correct Answer
    A. Hertz
    Explanation
    The unit for frequency is hertz. Hertz is a measure of the number of cycles or oscillations of a wave that occur in one second. It is commonly used to measure the frequency of sound waves, radio waves, and other types of waves.

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  • 3. 
    Describe A - ProProfs

    Describe A

    • Intensity

    • Amplitude

    • Frequency

    • Power

    • Period

    Correct Answer
    A. Amplitude
    Explanation
    Amplitude refers to the maximum displacement or distance from the equilibrium position in a wave. It represents the strength or intensity of the wave, indicating the maximum value or magnitude of the wave's oscillation. In other words, it measures the extent to which the wave deviates from its average or equilibrium position. Amplitude is a crucial parameter in understanding the behavior and characteristics of waves, as it directly affects the perception of loudness in sound waves and brightness in light waves.

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  • 4. 

    What is the unit of power?

    • Joules

    • Seconds

    • Watts

    • Cm

    Correct Answer
    A. Watts
    Explanation
    The unit of power is watts. Power is defined as the rate at which work is done or energy is transferred. It is calculated by dividing the amount of work or energy by the time taken. Watts is the standard unit for measuring power, named after the Scottish engineer James Watt. It is equivalent to one joule of work or energy per second.

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  • 5. 

    What is the unit for period?

    • Hertz

    • Cm

    • Seconds

    • Pascals

    Correct Answer
    A. Seconds
    Explanation
    The unit for period is seconds. The period is the time it takes for one complete cycle of a repeating event or wave to occur. It is measured in seconds because it represents the time interval. Hertz is the unit for frequency, not period. Centimeters and pascals are units used for measuring length and pressure respectively, and are not relevant to the measurement of period.

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  • 6. 

    What is the units for propagation speed

    • Meters

    • Seconds

    • Hertz

    • Meters per second

    Correct Answer
    A. Meters per second
    Explanation
    The units for propagation speed are meters per second. Propagation speed refers to the rate at which a wave travels through a medium. In this case, it is measured in meters per second, indicating the distance traveled by the wave in meters divided by the time taken in seconds. This unit is commonly used to express the speed of waves such as sound waves, light waves, and electromagnetic waves.

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  • 7. 

    The distance that a sound wave travel through a medium in a second

    • Amplitude

    • Speed

    • Power

    • Intensity

    • Density

    Correct Answer
    A. Speed
    Explanation
    Speed is the correct answer because it refers to the distance that a sound wave can travel through a medium in a given amount of time. It is a measure of how fast the sound wave is moving and is typically measured in meters per second. Amplitude, power, intensity, and density are all properties of sound waves, but they do not specifically refer to the distance traveled by the wave in a second.

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  • 8. 

    What is the unit for wavelength

    • Joules

    • Cm

    • Hertz

    • Pascals

    Correct Answer
    A. Cm
    Explanation
    The unit for wavelength is centimeters (cm). Wavelength is a measurement of the distance between two consecutive points in a wave, such as from one crest to the next crest. It is commonly represented by the symbol λ (lambda) and is measured in units of length, such as meters, centimeters, or nanometers. In this case, the correct answer is cm, indicating that wavelength is typically measured in centimeters.

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  • 9. 

    Frequency is determined by?

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Sound source
    Explanation
    The frequency of a sound wave is determined by the sound source. The sound source, such as a musical instrument or a person's voice, produces vibrations that create the sound waves. These vibrations determine the frequency, which refers to the number of cycles or vibrations per second. The medium through which the sound travels may affect the speed and intensity of the sound, but it does not determine the frequency. Therefore, the correct answer is sound source.

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  • 10. 

    Power is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Sound source
    Explanation
    Power is determined by the sound source. The power of a sound wave is directly related to the energy it carries. The sound source is responsible for generating the sound wave and determining the amount of energy it contains. The medium through which the sound wave travels may affect the propagation and intensity of the sound, but it does not directly determine the power of the sound wave. Therefore, the correct answer is the sound source.

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  • 11. 
    Which letter represents peak-to-peak amplitude? - ProProfs

    Which letter represents peak-to-peak amplitude?

    • B

    • D

    • E

    • F

    Correct Answer
    A. F
    Explanation
    The letter F represents peak-to-peak amplitude. Peak-to-peak amplitude refers to the difference between the highest and lowest points of a waveform. In this case, the letter F is the only option provided, so it must be the correct answer.

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  • 12. 

    Intensity is determined by ?

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Sound source
    Explanation
    The intensity of sound is determined by the sound source. The sound source is responsible for generating the sound waves, which carry the energy of the sound. The amplitude of the sound waves, which determines the intensity, is determined by the characteristics of the sound source, such as its power or vibration. The medium through which the sound travels can affect the propagation of the sound waves, but it does not directly determine the intensity of the sound. Therefore, the correct answer is sound source.

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  • 13. 

    As stiffness increases speed increase

    • True

    • False

    Correct Answer
    A. True
    Explanation
    This statement is true because as stiffness increases, the material or object becomes less flexible and more resistant to deformation. This increased stiffness allows for faster transmission of forces and energy, resulting in an increase in speed. Therefore, there is a direct correlation between stiffness and speed, with an increase in stiffness leading to an increase in speed.

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  • 14. 

    The ability of an object to resist compression

    • Volume

    • Density

    • Stiffiness

    Correct Answer
    A. Stiffiness
    Explanation
    Stiffness refers to the ability of an object to resist compression. It measures how much an object deforms under an applied force. A higher stiffness indicates that the object is more resistant to compression and will deform less. Therefore, stiffness is the correct answer as it directly relates to the given description of an object's ability to resist compression.

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  • 15. 

    Which of the following characterstics will create the slowest peed of sound?

    • High density, high stiffness

    • Low density, high stiffness

    • High density, low stiffness

    • Low density, low stiffness

    Correct Answer
    A. High density, low stiffness
    Explanation
    High density and low stiffness will create the slowest speed of sound. This is because sound waves travel slower in materials that are denser and have lower stiffness. Density refers to the mass of a material per unit volume, and high density means there are more particles packed closely together, which slows down the propagation of sound waves. Low stiffness means that the material is less resistant to deformation, resulting in slower sound wave transmission. Therefore, a combination of high density and low stiffness will result in the slowest speed of sound.

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  • 16. 

    Rate of energy transfer or rate at which work is performed

    • Intensity

    • Amplitude

    • Frequency

    • Power

    • Period

    Correct Answer
    A. Power
    Explanation
    Power is the correct answer because it refers to the rate at which work is performed or the rate of energy transfer. It is a measure of how quickly energy is being transferred or work is being done. Power is typically measured in units of watts and can be calculated by dividing the amount of work done by the time it takes to do it.

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  • 17. 
    Describe D - ProProfs

    Describe D

    • Intensity

    • Amplitude

    • Frequency

    • Wavelength

    • Power

    Correct Answer
    A. Wavelength
    Explanation
    Wavelength is the distance between two consecutive points in a wave that are in phase. It is usually represented by the symbol λ (lambda) and is measured in meters. Wavelength determines the color and pitch of a wave. In the context of light waves, shorter wavelengths correspond to higher frequencies and higher energy, while longer wavelengths correspond to lower frequencies and lower energy. In the context of sound waves, shorter wavelengths correspond to higher pitches, and longer wavelengths correspond to lower pitches.

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  • 18. 

    Number of particular eventts that occur in a specific duration of time

    • Power

    • Wavelength

    • Frequency

    • Amplitude

    • Intensity

    Correct Answer
    A. Frequency
    Explanation
    Frequency refers to the number of particular events that occur in a specific duration of time. It is a measure of how often a specific event or phenomenon repeats within a given time period. In the context of the options provided, power, wavelength, amplitude, and intensity do not directly relate to the number of events occurring in a specific time duration. Therefore, the correct answer is frequency.

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  • 19. 

    Concentration of the energy of a sound beam

    • Intensity

    • Amplitude

    • Frequency

    • Power

    • Period

    Correct Answer
    A. Intensity
    Explanation
    Intensity is the correct answer because it refers to the concentration of the energy of a sound beam. Intensity is defined as the amount of energy that passes through a unit area perpendicular to the direction of wave propagation per unit time. It is directly related to the amplitude of the sound wave and represents the strength or loudness of the sound. Therefore, intensity is a measure of how concentrated the energy of a sound beam is.

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  • 20. 

    Arrange from slowest of fastest

    • Lung, fat, soft tissue, liver, bood, muscle, tendons, bone

    • Lung, soft tissue, fat, liver, blood, muscle, tendons, bone

    • Bone, tendons, muscles, blood, liver, soft tissue, fat, lung

    • Bone, muscles, tendons, blood, liver, soft tissue, fat, lung

    Correct Answer
    A. Lung, fat, soft tissue, liver, bood, muscle, tendons, bone
  • 21. 

    As resolution increase frequency increases

    • True

    • False

    Correct Answer
    A. True
    Explanation
    As the resolution of an image increases, the number of pixels per unit area increases. This means that more details can be captured in the image, resulting in a higher level of clarity. As a result, the frequency of the image also increases, as there are more distinct details and patterns present. Therefore, the statement "As resolution increases, frequency increases" is true.

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  • 22. 

    Arrange from fastest to slowest

    • Air, metal, water

    • Water, metal, air

    • Metal, water, air

    Correct Answer
    A. Metal, water, air
    Explanation
    The given answer "metal, water, air" arranges the substances from fastest to slowest in terms of sound speed. Sound travels fastest through metal due to its high density and strong atomic bonds. Water comes next as it is denser than air and has a higher molecular arrangement. Air is the slowest as it has the lowest density and its particles are more spread out, resulting in a slower propagation of sound waves.

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  • 23. 

    What is the unit for intensity?

    • Joules

    • Watts

    • Hertz

    • Cm/second

    • Watts/cm2

    Correct Answer
    A. Watts/cm2
    Explanation
    The unit for intensity is watts/cm2 because intensity is defined as the amount of power per unit area. Power is measured in watts, and area is measured in square centimeters. Therefore, the unit for intensity is watts/cm2.

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  • 24. 

    As density increases speed increases

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "As density increases speed increases" is false. Density refers to the mass of an object divided by its volume. Speed, on the other hand, refers to the rate at which an object moves. These two concepts are not directly related. The speed of an object can be influenced by various factors such as force, friction, and resistance, but not necessarily by its density. Therefore, the statement is incorrect.

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  • 25. 

    The lower the frequency the lower the pentration

    • True

    • False

    Correct Answer
    A. False
    Explanation
    This statement is false. The frequency of a wave refers to the number of complete cycles of the wave that occur in one second. It does not determine the penetration ability of the wave. The penetration ability of a wave is determined by its wavelength. Generally, waves with higher frequencies have shorter wavelengths and are able to penetrate materials more effectively. Therefore, the lower the frequency, the higher the penetration ability of the wave.

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  • 26. 

    Relative weight of a material

    • Volume

    • Density

    • Stiffiness

    Correct Answer
    A. Density
    Explanation
    Density is a measure of how much mass is contained in a given volume of a material. It is calculated by dividing the mass of the material by its volume. The relative weight of a material refers to how heavy it is compared to other materials. Since density is a measure of mass per unit volume, it directly affects the weight of a material. Therefore, the density of a material is a determining factor in its relative weight.

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  • 27. 

    Is period adjustable?

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    The question asks whether the period is adjustable or not. The answer "No" indicates that the period is not adjustable.

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  • 28. 

    Is intensity adjustable?

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    The given question asks whether the intensity is adjustable or not. The answer "Yes" indicates that the intensity can be adjusted, implying that it is possible to change the level or strength of something, such as brightness, volume, or power.

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  • 29. 

    Which of the following characterstics will create the fastest speed of sound

    • High density, high stiffness

    • Low density, high stiffness

    • High density, low stiffness

    • Low density, low stiffness

    Correct Answer
    A. Low density, high stiffness
    Explanation
    Low density and high stiffness will create the fastest speed of sound. This is because low density allows sound waves to travel more easily through a medium, as there are fewer particles to obstruct their path. High stiffness, on the other hand, means that the medium can transmit the sound waves more efficiently, as it can quickly respond to the vibrations caused by the waves. Therefore, a combination of low density and high stiffness will result in the fastest speed of sound.

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  • 30. 

    What is the relationship between frequency and intensity

    • Direct

    • Inverse

    • None

    Correct Answer
    A. None
    Explanation
    Frequency and intensity do not have a direct or inverse relationship. Frequency refers to the number of occurrences of a repeating event per unit of time, while intensity refers to the strength or power of that event. These two factors are independent of each other and do not affect one another. Therefore, there is no relationship between frequency and intensity.

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  • 31. 

    Period is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Sound source
    Explanation
    The period of a sound wave is determined by the sound source. The period is the time it takes for one complete cycle of the wave to occur. The sound source, such as a vibrating object or instrument, determines the frequency of the wave, which in turn determines the period. Different sound sources produce waves with different frequencies, resulting in different periods. Therefore, the sound source plays a crucial role in determining the period of a sound wave.

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  • 32. 

    Amplitude is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Sound source
    Explanation
    The amplitude of a sound wave refers to the maximum displacement of particles in the medium from their equilibrium position. It is determined by the sound source, specifically the energy or force with which it creates the sound wave. The medium through which the sound travels does not affect the amplitude directly, but it can influence the propagation and transmission of the sound wave. Therefore, the correct answer is the sound source.

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  • 33. 

    What is teh relationship between wavelength and frequency?

    • Direct

    • Inverse

    • Proportional

    • None

    Correct Answer
    A. Inverse
    Explanation
    The relationship between wavelength and frequency is inverse. This means that as the wavelength increases, the frequency decreases, and vice versa. This can be observed in the wave equation, where the product of wavelength and frequency is equal to the speed of the wave. Therefore, if one of them increases, the other must decrease in order to maintain the same speed.

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  • 34. 

    The time it takes a wave to vibrate a single cycle, or time from the start of a cycle to the start of the next cycle

    • Period

    • Frequency

    • Wavelength

    • Speed

    • Power

    Correct Answer
    A. Period
    Explanation
    The correct answer is "Period". The period of a wave refers to the time it takes for a wave to complete one full cycle. It is the time interval between the start of a cycle and the start of the next cycle. In other words, it is the duration of one complete vibration or oscillation of a wave. The period is typically measured in seconds and is inversely related to the frequency of the wave.

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  • 35. 

    Audible sound

    • 20kHz

    • 20Hz-20kHz

    • 20,000 Hz

    • >20Hz

    Correct Answer
    A. 20Hz-20kHz
    Explanation
    The given answer, 20Hz-20kHz, represents the frequency range of audible sound. Audible sound refers to the range of sound frequencies that can be heard by the human ear. The lower limit of this range is around 20Hz, which is the lowest frequency that most people can perceive as sound. The upper limit is approximately 20kHz, which is the highest frequency that the average human ear can detect. Therefore, any sound within the range of 20Hz-20kHz is considered audible to the human ear.

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  • 36. 

    Is wavelenth adjustable

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    The question asks whether the wavelength is adjustable. The answer is "No" because the wavelength of a wave is determined by the source of the wave and the medium through which it travels. It is not something that can be easily adjusted or changed. The wavelength of a wave is a characteristic property that remains constant for a given source and medium.

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  • 37. 

    Ultrasound

    • >20,000Hz

    • 20,000 Hz

    • >20Hz

    • More than 20MKz

    Correct Answer
    A. >20,000Hz
    Explanation
    Ultrasound refers to sound waves with a frequency higher than the upper limit of human hearing, which is generally considered to be around 20,000 Hz. Therefore, the correct answer is ">20,000Hz" as it indicates a frequency range that is higher than what can be detected by the human ear.

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  • 38. 

    How much does the power increas/decrease if the amplited factor is 5

    • 5

    • 25

    • 1/5

    • 1/25

    Correct Answer
    A. 25
    Explanation
    The correct answer is 25 because when the amplification factor is 5, the power increases by a factor of 25. This is because power is proportional to the square of the amplification factor. So, when the amplification factor is 5, the power increases by 5*5=25 times.

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  • 39. 

    What is the typical value for frequency?

    • 10MHz-20MHz

    • 2 million - 10 million cm

    • 2 million to 10 million secons

    • 2Hz-10Hz

    • 2MHz-10Mhz

    Correct Answer
    A. 2MHz-10Mhz
    Explanation
    The typical value for frequency is usually measured in megahertz (MHz) or hertz (Hz). In this case, the given answer range of 2MHz-10MHz falls within the typical frequency range. This range is commonly used in various electronic devices and communication systems, such as radios, televisions, and computer processors. It represents a moderate frequency range that allows for efficient data transmission and processing without excessive interference or power consumption.

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  • 40. 

    What is the relationship between frequency and resolution

    • Direct

    • Inverse

    • None

    Correct Answer
    A. Direct
    Explanation
    Frequency and resolution have a direct relationship. As the frequency increases, the resolution also increases. This means that higher frequencies provide more detail and accuracy in the measurement or representation of a signal or phenomenon. Conversely, lower frequencies result in lower resolution, meaning less detail and accuracy. Therefore, frequency and resolution are directly proportional to each other.

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  • 41. 

    Is amplitude adjustable?

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    The given question asks whether the amplitude is adjustable or not. The correct answer is "Yes" because amplitude refers to the maximum displacement or distance from the equilibrium position in a wave or oscillation. In many cases, the amplitude can be adjusted or changed, either manually or through external factors, to increase or decrease the intensity or strength of the wave or oscillation.

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  • 42. 

    Sound with a frequency of 10MHz and sound with 20MHz travel and different speeds in the same medium

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Sound with different frequencies will travel at the same speed in the same medium. The speed of sound depends on the properties of the medium through which it is traveling, such as temperature and density, but not on the frequency of the sound waves. Therefore, sound waves with frequencies of 10MHz and 20MHz will travel at the same speed in the same medium.

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  • 43. 

    Speed increases as frequency increases

    • True

    • False

    Correct Answer
    A. False
    Explanation
    pg 41

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  • 44. 

    Is frequency adjustable?

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    The given question asks if the frequency is adjustable. The correct answer is "No." This means that the frequency is not adjustable.

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  • 45. 

    Speed is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Medium
    Explanation
    The speed of sound is determined by the medium through which it travels. Different mediums, such as air, water, or solids, have different properties that affect the speed at which sound waves can propagate. For example, sound travels faster in solids than in liquids, and faster in liquids than in gases. Therefore, the medium plays a crucial role in determining the speed of sound. The sound source itself does not directly affect the speed of sound, as it is primarily dependent on the properties of the medium.

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  • 46. 

    If the power if a wave is haved the intensity is reduced to one-fourth ots original value

    • True

    • False

    Correct Answer
    A. False
    Explanation
    pg 41

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  • 47. 

    What is the typical value of amplitude

    • Distance, density, cm

    • Pressure, distance, pascals

    • Density, pressure, volume

    • Pressure, density, distance

    Correct Answer
    A. Pressure, density, distance
    Explanation
    The typical value of amplitude is not mentioned in the question or answer choices. Therefore, an explanation cannot be provided.

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  • 48. 

    Wavelength is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Both
    Explanation
    The wavelength of a sound wave is determined by both the sound source and the medium it travels through. The sound source, such as a musical instrument or a person's voice, produces the sound wave with a specific frequency. The medium, which can be air, water, or any other substance, affects how the sound wave travels and can alter its wavelength. Therefore, both the characteristics of the sound source and the properties of the medium play a role in determining the wavelength of a sound wave.

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  • 49. 

    What is the relationship between frequency and power

    • Direct

    • Inverse

    • None

    Correct Answer
    A. None
    Explanation
    Frequency and power are not directly or inversely related. The relationship between frequency and power depends on the specific context or system being considered. In some cases, an increase in frequency may lead to an increase in power, while in other cases, it may have no effect on power. Similarly, a decrease in frequency may or may not result in a decrease in power. Therefore, the relationship between frequency and power cannot be generalized as direct or inverse, hence the correct answer is none.

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  • Current Version
  • Jun 23, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 05, 2009
    Quiz Created by
    Brett81

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