Comprehensive SPI Practice Test

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  • 1/180 Questions

    Sound waves are

    • Electric
    • Mechanical transverse
    • Spectral
    • Longitudinal mechanical
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About This Quiz

The 'Comprehensive SPI Practice Test' assesses knowledge of ultrasound (US) physics, focusing on sound waves, US speed in soft tissue, frequency limits, acoustic variables, and propagation properties. Ideal for those preparing for medical physics or radiology certifications.

Comprehensive SPI Practice Test - Quiz

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  • 2. 

    The frequency closest to the lower limit of US is

    • 19.000 kHz

    • 10.000 MHz

    • 20.000 msec

    • 15.000 Hz

    Correct Answer
    A. 15.000 Hz
    Explanation
    The frequency closest to the lower limit of the US is 15.000 Hz. This is because the question asks for the frequency closest to the lower limit, and out of the given options, 15.000 Hz is the lowest frequency.

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  • 3. 

    Which is not an acoustic variable?

    • Density

    • Pressure

    • Distance

    • Intensity

    Correct Answer
    A. Intensity
    Explanation
    4 Variables include: Pressure, Density, Particle Motion (Distance), Temperature

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  • 4. 

    The effects of soft tissue on US are called:

    • Acoustic proliferation properties

    • Dynamic effects

    • Acoustic propagation properties

    • Biologic effects

    Correct Answer
    A. Acoustic propagation properties
    Explanation
    The effects of soft tissue on ultrasound are referred to as acoustic propagation properties. This term encompasses the way in which sound waves travel through and interact with soft tissues in the body. It includes factors such as absorption, scattering, and reflection of the ultrasound waves as they pass through different types of soft tissue. Understanding the acoustic propagation properties is crucial in interpreting ultrasound images and diagnosing various medical conditions.

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  • 5. 

    All of the following are true EXCEPT:

    • Two waves with identical frequencies must interfere constructively

    • Constructive inferference is associated with waves that are in-phase

    • Out-of-phase waves inferfere destructively

    • Waves of different frequencies may exhibit both constructive and destructive interference at different times

    Correct Answer
    A. Two waves with identical frequencies must interfere constructively
    Explanation
    This statement is not true because two waves with identical frequencies can interfere destructively if they have a phase difference of half a wavelength.

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  • 6. 

    Put in decreasing order

    • Deca

    • Deci

    • Micro

    • Centi

    Correct Answer(s)
    A. Deca
    A. Deci
    A. Micro
    A. Centi
    Explanation
    deca -- deci -- centi -- micro

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  • 7. 

    ______ is the time to complete on cycle

    • Pulse duration

    • Pulse period

    • Period

    • Duration period

    Correct Answer
    A. Period
    Explanation
    Period is the length of time it takes for one single cycle to occur. Unit of time microsecond (us)

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  • 8. 

    Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?

    • 30 KHz

    • 8 MHz

    • 8.00 Hz

    • 3.00 kHz

    • 15 Hz

    Correct Answer
    A. 30 KHz
    Explanation
    Ultrasonic sound waves are sound waves with frequencies higher than the upper limit of human hearing, which is typically around 20 kHz. The sound waves with frequencies of 30 KHz and 3.00 kHz fall into the ultrasonic range, but 30 KHz is the least useful in diagnostic imaging because it has a higher frequency and shorter wavelength, which makes it more prone to attenuation and scattering in tissues, resulting in poor image quality. In contrast, 3.00 kHz has a lower frequency and longer wavelength, allowing it to penetrate deeper into tissues and produce clearer diagnostic images. The other options, 8 MHz and 8.00 Hz, are not ultrasonic frequencies and are not commonly used in diagnostic imaging.

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  • 9. 

    What is the frequency of a wave with 1 msec period?

    • 10.00 Hz

    • 1.00 kHz

    • 1 kHz

    • 1 MHz

    Correct Answer
    A. 1 kHz
    Explanation
    The frequency of a wave is the number of complete cycles it completes in one second. In this case, the wave has a period of 1 millisecond, which means it completes one cycle every 1 millisecond. To convert this to frequency, we can use the formula: frequency = 1 / period. So, the frequency of the wave is 1 / 0.001 = 1000 Hz, which is equivalent to 1 kHz.

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  • 10. 

    _____ is the distance covered by one cycle.

    • Pulse length

    • Wavelength

    • Cycle distance

    • Cycle duration

    Correct Answer
    A. Wavelength
    Explanation
    wavelength is the length of space that one wave occupies, usually measured in mm, meters, inches.

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  • 11. 

    Which of the following is determined by the source and the medium?

    • Frequency

    • Period

    • Propagation speed

    • Range resolution

    Correct Answer
    A. Range resolution
    Explanation
    Range resolution is determined by the source and the medium. Range resolution refers to the ability to distinguish between two closely spaced objects in the range direction. It is influenced by factors such as the wavelength of the signal emitted by the source and the characteristics of the medium through which the signal propagates. A shorter wavelength and a higher propagation speed can improve range resolution, allowing for better discrimination between objects. Therefore, range resolution is dependent on the source and the medium used in the measurement.

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  • 12. 

    Propagation speed = _______ x wavelength

    • Pulse duration

    • Period

    • Number of cycles in the pulse

    • Frequency

    Correct Answer
    A. Frequency
    Explanation
    Propagation speed is determined by the frequency of the wave. The frequency of a wave refers to the number of cycles it completes in a given time period. As the frequency increases, the wavelength decreases, resulting in a higher propagation speed. Therefore, the correct answer is frequency.

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  • 13. 

    As a result  of _____ the propagation speed increases.

    • Increasing stiffness and increasing density

    • Increasing stiffness and increasing elasticity

    • Decreasing compressibility and decreasing density

    • Decreasing stiffness and decreasing density

    Correct Answer
    A. Decreasing compressibility and decreasing density
    Explanation
    Increasing stiffness and increasing density would actually decrease the propagation speed, as the wave would have a harder time propagating through a stiffer and denser medium. On the other hand, decreasing compressibility and decreasing density would make the medium less resistant to deformation and less dense, allowing the wave to propagate more easily and at a higher speed.

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  • 14. 

    Sound waves carry energy

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Sound waves carry energy because they are mechanical waves that propagate through a medium by transferring energy from one particle to another. As sound waves travel, they cause the particles in the medium to vibrate, and this vibration transfers energy in the form of kinetic energy from particle to particle. This energy can then be detected and perceived as sound by our ears. Therefore, it is true that sound waves carry energy.

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  • 15. 

    Sound waves are longitudinal waves sound travels in a straight line

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Sound waves are indeed longitudinal waves, meaning that the particles in the medium vibrate parallel to the direction of wave propagation. This is in contrast to transverse waves, where the particles vibrate perpendicular to the direction of wave propagation. Additionally, sound waves do travel in a straight line, as long as the medium through which they are propagating is uniform and undisturbed. However, sound waves can also be affected by factors such as reflection, refraction, and diffraction, which can cause them to deviate from a straight path.

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  • 16. 

    What are the acousitic variables?

    • Pressure, density, distance

    • Period, frequency, amplitude, power, intensity, wavelength, propagation speed

    Correct Answer
    A. Pressure, density, distance
    Explanation
    The acoustic variables are the properties that describe sound waves. Pressure refers to the force exerted by the sound wave on a surface, density is the mass of the air molecules in the sound wave, and distance is the physical separation between two points in the wave. These variables help us understand and measure the characteristics of sound waves.

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  • 17. 

    What are the acoustic parameters?

    • Pressure density distance

    • Period frequency amplitude power intensity wavelength propagation speed

    Correct Answer
    A. Period frequency amplitude power intensity wavelength propagation speed
    Explanation
    The given answer lists the various acoustic parameters, which include period, frequency, amplitude, power, intensity, wavelength, and propagation speed. These parameters are used to describe and measure different aspects of sound waves. The period refers to the time it takes for one complete cycle of a wave, frequency is the number of cycles per second, amplitude is the maximum displacement of the wave from its equilibrium position, power is the rate at which energy is transferred by the wave, intensity is the amount of energy per unit of area, wavelength is the distance between two consecutive points in a wave, and propagation speed is the speed at which the wave travels through a medium.

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  • 18. 

    A pair of waves are considered out of phase when their peaks occur at the same time and location

    • True

    • False

    Correct Answer
    A. False
    Explanation
    the correct answer to this will be in phase NOT out of phase

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  • 19. 

    Period and frequency are determined by?

    • Sound source

    • Sound source and medium

    • Medium

    Correct Answer
    A. Sound source
    Explanation
    The period and frequency of a sound wave are determined by the characteristics of the sound source. The period refers to the time it takes for one complete cycle of the wave, while the frequency is the number of cycles per second. These properties are influenced by factors such as the vibrating object or instrument creating the sound. The medium through which the sound travels does not directly affect the period and frequency of the sound wave.

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  • 20. 

    Period and frequency are

    • Inversely

    • Directly

    • Proportional

    • Reciprocal

    Correct Answer(s)
    A. Inversely
    A. Reciprocal
    Explanation
    Period and frequency are inversely related. This means that as the period increases, the frequency decreases, and vice versa. The reciprocal relationship between period and frequency can be mathematically expressed as: frequency = 1 / period. Therefore, if the period doubles, the frequency is halved, and if the period is halved, the frequency doubles.

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  • 21. 

    Amplitude , power, intensity are determined by the

    • Medium

    • Sound source

    • Both sound source and medium

    Correct Answer
    A. Sound source
    Explanation
    The amplitude, power, and intensity of a sound wave are determined by the sound source. The sound source is responsible for creating the vibrations that generate the sound wave. The amplitude of a sound wave is the maximum displacement of the particles in the medium caused by the sound source. The power of the sound wave is the rate at which energy is transferred by the sound source. The intensity of the sound wave is the power per unit area and is also determined by the sound source. Therefore, the correct answer is the sound source.

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  • 22. 

    Amplitude, power, intensity are not adjustable

    • True

    • False

    Correct Answer
    A. False
    Explanation
    all three ARE adjustable

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  • 23. 

    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 through which it travels. 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 the speed at which the sound wave travels. The wavelength is the distance between two consecutive points of the wave that are in phase with each other. 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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  • 24. 

    As frequency increases, wavelength decreases

    • True

    • False

    Correct Answer
    A. True
    Explanation
    As frequency increases, the number of waves passing a given point per second increases. Since the speed of waves remains constant, an increase in frequency means that the waves have less time to travel a certain distance. Therefore, the wavelength, which is the distance between two consecutive points in a wave, decreases. This relationship between frequency and wavelength is known as the inverse relationship, where an increase in frequency corresponds to a decrease in wavelength.

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  • 25. 

    Which type of wavelength sound produces higher quality images with greater detail?

    • Short

    • Long

    • Either one

    Correct Answer
    A. Short
    Explanation
    Short wavelength sound produces higher quality images with greater detail because shorter wavelengths have a higher frequency and can capture more detailed information. This allows for a more precise representation of the sound waves, resulting in a clearer and more detailed image. Longer wavelength sound, on the other hand, has a lower frequency and captures less detailed information, leading to lower quality images with less detail. Therefore, short wavelength sound is preferred for producing higher quality images.

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  • 26. 

    Propagation speed is determined by

    • Sound source

    • Medium

    • Both

    Correct Answer
    A. Medium
    Explanation
    The correct answer is "medium". The propagation speed of sound is determined by the medium through which it travels. Different mediums have different densities and elastic properties, which affect the speed at which sound waves can travel through them. In general, sound travels faster in denser mediums, such as solids, and slower in less dense mediums, such as gases. Therefore, the medium plays a crucial role in determining the propagation speed of sound.

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  • 27. 

    What is the speed in liver?

    • 1540 m/s

    • 1450 m/s

    • 1560 m/s

    • 3500 m/s

    Correct Answer
    A. 1560 m/s
  • 28. 

    If the power of a wave is tripled the intensity is reduced to one third

    • True

    • False

    Correct Answer
    A. False
    Explanation
    remember , power is related to the intensity (pg.31)
    so if power is tripled the intensity is tripled as well

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  • 29. 

    The effects of sound waves on tissue in the body are called?

    • Acoustic propagation properties

    • Bioeffects

    Correct Answer
    A. Bioeffects
    Explanation
    The term "bioeffects" refers to the effects of sound waves on tissue in the body. Sound waves can have various impacts on biological systems, including heating, cavitation, and mechanical stress. These effects can be both beneficial, such as in therapeutic ultrasound, or harmful, such as in excessive exposure to loud noise. Understanding the bioeffects of sound waves is crucial in fields like medicine and occupational health to ensure the safe and effective use of sound-based technologies.

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  • 30. 

    The start of a pulse to the end of that pulse is reffering to ....

    • Spatial pulse length

    • Pulse repition period

    • Pulse repition frequency

    • Dulse duration

    Correct Answer
    A. Dulse duration
    Explanation
    The term "pulse duration" refers to the time it takes for a single pulse to occur, from the beginning to the end. It is a measure of the length of time that the pulse is active or "on". Therefore, the correct answer is "pulse duration".

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  • 31. 

    What is pulse duration's formula?

    • # of cycles x wavelength / frequency

    • Has no formula

    • # of cycles x wavelength

    • # of cycles / frequency

    Correct Answer
    A. # of cycles / frequency
    Explanation
    The pulse duration of a wave is defined as the time it takes for one complete cycle of the wave. It is measured in seconds. In this case, the formula for pulse duration is given as the number of cycles divided by the frequency. This makes sense because dividing the number of cycles by the frequency gives the time it takes for one complete cycle. Therefore, the correct answer is "# of cycles / frequency".

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  • 32. 

    Pulse duration is directly related to the frequency

    • True

    • False

    Correct Answer
    A. False
    Explanation
    pulse duration is INVERSELY proportional to the frequency
    recall that pulse duration formula is # cycles / frequency
    pg. 48

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  • 33. 

    What is spatial pulse length definition?

    • Distance that a pulse occupies in space from start to the end of a pulse

    • Time that a pulse occupies in space from start to the end of a pulse

    • Time from the start of a pulse to the start of the next pulse

    • The number of pulses that an ultrasound system transmits into the body each second

    Correct Answer
    A. Distance that a pulse occupies in space from start to the end of a pulse
    Explanation
    The spatial pulse length definition refers to the distance that a pulse occupies in space from start to the end of a pulse. This means that it measures the physical length of the pulse as it travels through space. It does not refer to the time it takes for the pulse to travel or the number of pulses transmitted per second.

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  • 34. 

    Is pulse repition period (PRP) adjustable?

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    The pulse repetition period (PRP) is the time interval between consecutive pulses in a pulse train. It determines the maximum range that can be measured by a radar system. The PRP is adjustable in radar systems to accommodate different operating conditions and requirements. By adjusting the PRP, the radar system can optimize its performance for various purposes such as increasing range resolution or reducing the effects of clutter. Therefore, the statement "yes" is correct because the PRP is indeed adjustable in radar systems.

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  • 35. 

    Depth of view describes the minimum distance into the body that an ultrasound system is imaging

    • True

    • False

    Correct Answer
    A. False
    Explanation
    describes the MAXIMUM distance

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  • 36. 

    How are PRP and depth related?

    • Directly

    • Inversly

    • No relationship

    Correct Answer
    A. Directly
    Explanation
    when PRP increases , depth of view increases

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  • 37. 

    With deeper imaging will the listening time lengthen?

    • Yes

    • No

    • Listening time has nothing to do with deep imaging

    Correct Answer
    A. Yes
    Explanation
    The correct answer is "yes" because deeper imaging allows for a more detailed examination of the subject, which in turn can lead to a longer listening time. This is because the additional information obtained from deeper imaging can provide more insights and nuances that may require more time to fully comprehend and analyze.

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  • 38. 

    PRF and frequency are related

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "PRF and frequency are related" is false. PRF stands for Pulse Repetition Frequency, which is the number of pulses emitted per second. Frequency, on the other hand, refers to the number of cycles of a wave that occur in one second. While both PRF and frequency are related to the timing of waveforms, they are not directly related to each other. PRF is more commonly used in radar systems, while frequency is a fundamental property of any wave.

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  • 39. 

    When the sonographer adjusts the depth of view to 30 cm, what happens to the pulse repetition frequency?

    • Reduced

    • Increased

    Correct Answer
    A. Reduced
    Explanation
    When the sonographer adjusts the depth of view to 30 cm, the pulse repetition frequency is reduced. This is because the depth of view refers to the distance that the ultrasound waves need to travel. When the depth of view is increased, the ultrasound waves need to travel a longer distance, and therefore, the pulse repetition frequency needs to be reduced in order to maintain image quality.

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  • 40. 

    Which of these values for PRF would have the longest PRP?

    • 3 kHz

    • 5,321 Hz

    • 1 Hz

    • 3 Hz

    Correct Answer
    A. 1 Hz
    Explanation
    the correct answer is C because the question asks for the longest PRP
    since PRF and PRP are reciprocals you will have to look for the lowest PRF

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  • 41. 

    What is the duty factors formula?

    • Pulse duration x 100

    • Pulse duration/ PRP

    • PRP x 100

    • Pulse duration / PRP x100

    Correct Answer
    A. Pulse duration / PRP x100
    Explanation
    The duty factor is a measure of the amount of time a pulse is "on" or active compared to the total pulse repetition period (PRP). It is calculated by dividing the pulse duration by the PRP and then multiplying by 100 to express it as a percentage. Therefore, the formula for calculating the duty factor is pulse duration / PRP x 100.

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  • 42. 

    What occurs on shallow imaging on  PRP?

    • Shorter PRP

    • Longer PRP

    Correct Answer
    A. Shorter PRP
    Explanation
    Shallow imaging on PRP refers to the use of a shorter pulse repetition period (PRP) in ultrasound imaging. PRP is the time interval between consecutive ultrasound pulses. When the PRP is shorter, it means that the ultrasound machine is sending pulses more frequently. This results in a higher pulse repetition frequency (PRF) which allows for better resolution and imaging of superficial structures. Therefore, a shorter PRP would lead to improved visualization of shallow tissues and structures during ultrasound imaging.

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  • 43. 

    The sonographer changes duty factor when imaging depth is altered

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The duty factor is the fraction of time that the ultrasound system is transmitting a pulse. When imaging depth is altered, the sonographer needs to adjust the duty factor to ensure that the ultrasound pulses are appropriately spaced to allow for proper imaging at the new depth. Therefore, it is true that the sonographer changes the duty factor when imaging depth is altered.

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  • 44. 

    What is the log of 100?

    • 1

    • 2

    • 10

    • 20

    Correct Answer
    A. 2
    Explanation
    10 x 10 = 100

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  • 45. 

    What is the meaning of 3dB?

    • Ten times larger

    • Three times larger

    • Half

    • Doubled

    Correct Answer
    A. Doubled
    Explanation
    The meaning of 3dB is doubled. In electronics and signal processing, decibels (dB) are used to measure the ratio of two power levels. A 3dB increase represents a doubling of power or amplitude, while a 3dB decrease represents a halving of power or amplitude. Therefore, when something is described as being 3dB, it means that it has doubled in power or amplitude compared to the reference level.

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  • 46. 

    When the boundary is smooth, the sound is reflected in only one direction in an organized matter is called

    • Diffue reflection

    • Specular

    • Scattering

    • Rayleigh scattering

    Correct Answer
    A. Specular
    Explanation
    When the boundary is smooth, the sound waves reflect in a specific direction in an organized manner. This type of reflection is known as specular reflection. In specular reflection, the angle of incidence is equal to the angle of reflection, resulting in a clear and focused reflection.

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  • 47. 

    Diffuse reflection or back scattering is when the interfaces in the body are not smooth, but have some irregularities. when a wave reflects off an irregular surface, radiates in more than one direction

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Diffuse reflection or back scattering occurs when the interfaces within a body are not smooth and have irregularities. In this case, when a wave reflects off an irregular surface, it radiates in more than one direction. This means that the wave scatters or spreads out in various directions instead of reflecting in a single, focused direction. Therefore, the given answer that this statement is true is correct.

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  • 48. 

    The half value thickness is the distance that sound travels in a tissue that reduces the intensity of sound to one-third its original value.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    intensity of sound to ONE-HALF it original value

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  • 49. 

    The half value layer thickness depends on which factor(s)

    • The frequency of sound

    • Medium

    • Both

    Correct Answer
    A. Both
    Explanation
    The half value layer thickness depends on both the frequency of sound and the medium. The half value layer thickness refers to the distance that sound travels through a medium before its intensity is reduced by half. The frequency of sound affects the attenuation of sound waves, with higher frequencies being more easily absorbed by the medium. The type of medium also plays a role, as different materials have different absorption properties. Therefore, both the frequency of sound and the medium contribute to determining the half value layer thickness.

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  • Current Version
  • Dec 02, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 04, 2018
    Quiz Created by
    Jackie

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