# Ultrasound Physics Chapter 1-2

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Quizzes Created: 3 | Total Attempts: 1,696
Questions: 29 | Attempts: 1,523  Settings  You may be familiar with the term ultrasound with regards to medicine – usually pregnancy – detecting invisible flaws, the testing of products and structures, detecting objects and measuring distances. What do you know about the physics behind it?

• 1.

### THE HORIZONTAL AXIS?

• A.

X-AXIS

• B.

Y-AXIS

A. X-AXIS
Explanation
The correct answer is X-AXIS. The question is asking for the name of the horizontal axis. In a Cartesian coordinate system, the horizontal axis is called the X-axis. It represents the independent variable in a graph and is typically used to represent time, distance, or other continuous variables. The Y-axis, on the other hand, represents the dependent variable and is vertical. Therefore, the X-axis is the correct answer for the given question.

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• 2.

### THE VERTICLE AXIS?

• A.

X-AXIS

• B.

Y-AXIS

B. Y-AXIS
Explanation
The correct answer is Y-AXIS. In a Cartesian coordinate system, the vertical axis is represented by the Y-axis. The Y-axis is perpendicular to the X-axis and is used to measure the vertical position or value of a point. It helps in determining the height or depth of a point or object in relation to the horizontal X-axis.

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• 3.

### DIFINE THE TERM UNRELATED?

• A.

TWO ITEMS THAT ARE ASSCOIATED

• B.

TWO ITEMS THAT ARE NOT ASSOCIATED

B. TWO ITEMS THAT ARE NOT ASSOCIATED
Explanation
The term "unrelated" refers to two items that do not have any connection or association with each other. It implies that there is no relationship, similarity, or relevance between the two items. They are completely independent and unrelated in terms of their characteristics, attributes, or functions.

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• 4.

### DIFINE THE TERM DIRECTLY RELATED?

• A.

TWO ITEMS THAT ARE ASSOCIATED SUCH THAT WHEN ONE INCREASES THE OTHER INCREASES.

• B.

TWO ITEMS THAT ARE ASSOCIATED SUCH THAT WHEN ONE INCREASES THE OTHER DECREASES.

A. TWO ITEMS THAT ARE ASSOCIATED SUCH THAT WHEN ONE INCREASES THE OTHER INCREASES.
Explanation
The term "directly related" refers to two items that have a positive correlation, meaning that when one item increases, the other item also increases. This suggests that there is a direct relationship between the two variables, and they move in the same direction.

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• 5.

### TWO ITEMS THAT ARE ASSOCIATED SUCH THAT WHEN ONE ITEM INCREASES THE OTHER DECREASES IS CALLED INVERSELY RELATED.

• A.

True

• B.

False

A. True
Explanation
When two items are inversely related, it means that as one item increases, the other item decreases. This relationship is often seen in mathematical equations or graphs, where an increase in one variable corresponds to a decrease in the other variable. In this case, the statement correctly defines the term "inversely related," stating that two items associated in this way are called inversely related. Therefore, the correct answer is true.

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• 6.

### WHEN TWO NUMBERS WITH A RECIPROCAL RELATIONSHIP ARE MULTIPLIED THE ANSWER IS?

1
Explanation
When two numbers have a reciprocal relationship, it means that one number is the reciprocal of the other. The reciprocal of a number is obtained by dividing 1 by that number. When these two numbers are multiplied, the reciprocal relationship cancels out and the result is always 1.

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• 7.

### WHAT IS THE RECPROCAL OF 20?

• A.

1/20

• B.

20

• C.

1

• D.

20.

A. 1/20
Explanation
The reciprocal of a number is the fraction obtained by interchanging the numerator and the denominator. In this case, the reciprocal of 20 is 1/20 because when we interchange the numerator and denominator, we get the fraction 1/20.

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• 8.

### WHAT IS THE RECIPROCAL OF 10?

• A.

5

• B.

.10

• C.

100

• D.

1/10

D. 1/10
Explanation
The reciprocal of a number is the multiplicative inverse of that number. In other words, when you multiply a number by its reciprocal, the result is always 1. In this case, the reciprocal of 10 is 1/10 because when you multiply 10 by 1/10, you get 1. Therefore, the correct answer is 1/10.

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• 9.

### THE RECIPROCAL OF 2 IS 2/10

• A.

True

• B.

False

B. False
Explanation
The reciprocal of a number is obtained by dividing 1 by that number. In this case, the reciprocal of 2 is 1/2. However, the given answer states that the reciprocal of 2 is 2/10, which is incorrect. Therefore, the correct answer is False.

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• 10.

### INCREASE BY A FACTOR MEANS TO ADD

• A.

True

• B.

False

B. False
Explanation
The given statement is false. "Increase by a factor" does not mean to add. Instead, it means to multiply the original value by the specified factor. Adding would result in an increase by a fixed value, not a factor.

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• 11.

### WHAT DOES THE TERM DECREASE BY A FACTOR MEAN?

• A.

MULTIPLY

• B.

• C.

DIVIDE

• D.

SUBTRACT

C. DIVIDE
Explanation
The term "decrease by a factor" refers to dividing a quantity by a certain number. When something decreases by a factor, it means that it is being divided by that factor, resulting in a smaller value. Therefore, the correct answer is "DIVIDE".

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• 12.

### 1,000,000= ?

• A.

1.0X10 SIXTH POWER

• B.

1.0X10 EIGTH POWER

• C.

10X1

• D.

1

A. 1.0X10 SIXTH POWER
Explanation
The correct answer is 1.0X10 SIXTH POWER. This is because the notation 1.0X10 raised to the power of 6 represents the number 1 followed by 6 zeros, which is equal to 1,000,000.

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• 13.

### HOW MANY CENTIMETERS ARE 3 IN METERS?

• A.

1/3000

• B.

1/3

• C.

300

• D.

3000

C. 300
Explanation
The question asks for the number of centimeters in 3 meters. Since there are 100 centimeters in 1 meter, to find the number of centimeters in 3 meters, we multiply 100 by 3, which equals 300. Therefore, the correct answer is 300.

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• 14.

### HOW MANY MILLILITERS ARE IN 8 LITERS?

• A.

1/8

• B.

8

• C.

80

• D.

8000

D. 8000
Explanation
There are 1000 milliliters in 1 liter. Therefore, to find the number of milliliters in 8 liters, we multiply 8 by 1000, which equals 8000 milliliters.

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• 15.

### HOW MANY HERTZ IS 4MHz?

• A.

4

• B.

4,000,000

• C.

.0004

• D.

400

B. 4,000,000
Explanation
The correct answer is 4,000,000. Hertz is a unit of frequency, which measures the number of cycles per second. In this case, 4MHz means 4 million cycles per second. Therefore, the correct answer is 4,000,000.

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• 16.

### HOW MUCH BIGGER IS A BILLION THAN A MILLION?

• A.

10 TIMES

• B.

300 TIMES

• C.

1000 TIMES

• D.

100 TIMES

C. 1000 TIMES
Explanation
A billion is 1000 times bigger than a million. This is because a billion is equal to 1000 million. So, if we compare the size or quantity of something in billions to the same thing in millions, we would have 1000 times more in billions.

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• 17.

### A THOUSAND IS 100 TIMES BIGGER THAN TEN

• A.

True

• B.

False

A. True
Explanation
The statement "A THOUSAND IS 100 TIMES BIGGER THAN TEN" is true because a thousand is indeed 100 times bigger than ten. This is because 1000 divided by 10 equals 100, which means that a thousand is made up of 100 sets of ten. Therefore, the answer is true.

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• 18.

### A BOX CONTAINS 3 POUNDS OF TOMATOES.THE TOMATOES ARE INCREASED BY A FACTOR OF 5. HOW MANY TOMATOES ARE ARE IN THE BOX?

• A.

6 POUNDS

• B.

15 POUNDS

• C.

30 POUNDS

• D.

60 POUNDS

B. 15 POUNDS
Explanation
The weight of the tomatoes in the box is increased by a factor of 5. Therefore, the new weight of the tomatoes in the box is 3 pounds multiplied by 5, which equals 15 pounds.

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• 19.

### ALL WAVES CARRY ENERGY FROM ONE LOCATION TO THE OTHER.

• A.

True

• B.

False

A. True
Explanation
Waves are a form of energy transfer. They carry energy from one location to another through the oscillation or vibration of particles in a medium or through the propagation of electromagnetic fields. This energy transfer can be observed in various types of waves, such as sound waves, water waves, and light waves. Therefore, it is true that all waves carry energy from one location to another.

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• 20.

### SOUND IS....

• A.

SHORT

• B.

MECHANICAL

• C.

FAST

• D.

DIAGNOL

B. MECHANICAL
Explanation
Sound is mechanical because it is a form of energy that travels through mechanical waves. Sound waves are produced by the vibration of an object, which causes the particles in the surrounding medium (such as air, water, or solids) to vibrate and transfer the energy from one particle to another. This mechanical wave then reaches our ears, where it is detected and interpreted as sound.

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• 21.

### SOUND DOES NOT REQUIRE A MEDIUM TO TRAVEL THROUGH.

• A.

True

• B.

False

B. False
Explanation
Sound does require a medium to travel through. Sound waves are created by the vibration of particles in a medium, such as air, water, or solids. These vibrations cause the particles to compress and expand, creating a wave that travels through the medium. Without a medium, such as in a vacuum, sound waves cannot propagate as there are no particles to vibrate and transmit the sound energy. Therefore, the statement that sound does not require a medium to travel through is false.

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• 22.

### SOUND TRAVELS IN A    LINE.

STRAIGHT
Explanation
Sound travels in a straight line. This means that sound waves propagate in a linear path from the source of the sound to the receiver. Unlike light, which can be reflected, refracted, or diffracted, sound waves travel in a direct line unless they encounter obstacles or are affected by other factors such as temperature or humidity. This property of sound allows us to determine the direction and distance of the source based on the path of the sound waves.

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• 23.

### SOUND WAVES ARE

LONGITUDINAL
Explanation
Sound waves are longitudinal because they propagate by causing particles in the medium to vibrate back and forth in the same direction as the wave is moving. In other words, the particles oscillate parallel to the direction of wave propagation. This is different from transverse waves, where the particles oscillate perpendicular to the direction of wave propagation. Longitudinal waves can be visualized as a series of compressions and rarefactions, where the particles are pushed together and then spread apart. Examples of longitudinal waves include sound waves, seismic waves, and pressure waves.

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• 24.

### THE EFFECTS OF THE MEDIUM UPON THE SOUND WAVE ARE CALLED BIOLOGIC EFFECTS.

• A.

True

• B.

False

B. False
Explanation
The statement "The effects of the medium upon the sound wave are called biologic effects" is false. The effects of the medium upon the sound wave are actually called acoustic effects, not biologic effects. Biologic effects refer to the impact of sound waves on living organisms, such as hearing damage or physiological responses. Acoustic effects, on the other hand, pertain to the changes in the sound wave itself as it travels through different mediums, such as reflection, refraction, or absorption.

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• 25.

### THE EFFECTS OF THE SOUND WAVE UPON THE BIOLOGIC TISSUE THROUGH WHICH IT PASSES IS CALLED BIOLOGIC EFFECTS.

• A.

True

• B.

False

A. True
Explanation
The statement is true because the effects of a sound wave on biologic tissue are indeed called biologic effects. Sound waves can have various effects on living tissue, such as heating, cavitation (formation of bubbles), and mechanical stress. These effects can have both beneficial and harmful consequences depending on the intensity and duration of exposure. Therefore, it is important to understand and study the biologic effects of sound waves to ensure the safety and well-being of living organisms.

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• 26.

### WHAT ARE THE 3 ACOUSTIC VARIABLES?

• A.

PRESSURE

• B.

FREQUENCY

• C.

PERIOD

• D.

DENSITY

• E.

DISTANCE

A. PRESSURE
D. DENSITY
E. DISTANCE
Explanation
The three acoustic variables are pressure, density, and distance. These variables play a crucial role in understanding and describing sound waves. Pressure refers to the force exerted by the sound wave on a surface, density represents the mass of air molecules in a given volume, and distance refers to the physical separation between two points in the wave. By studying and analyzing these variables, we can gain a comprehensive understanding of the characteristics and behavior of sound waves.

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• 27.

### PARTICLES MOVE IN A DIRECTION THAT IS PERPENDICULAR TO THE DIRECTION THAT THE WAVE PROPAGATES.

• A.

LONGITUDINAL WAVES

• B.

BACKWARDS WAVES

• C.

TRANSVERSE WAVES

• D.

FAST WAVES

C. TRANSVERSE WAVES
Explanation
Transverse waves are characterized by particles moving in a direction that is perpendicular to the direction that the wave propagates. In these waves, the particles oscillate up and down or side to side as the wave passes through them. This is different from longitudinal waves, where the particles move parallel to the direction of wave propagation. Therefore, the given statement aligns with the definition of transverse waves.

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• 28.

### 2 WAVES ARE TRAVELING IN A MEDIUM AND ARRIVE AT A LOCATION AT THE SAME TIME .WHAT EVENTS TAKE PLACE?

• A.

WAVES OF DIFFERENT AMPLITUDE

• B.

DESTRUCTIVE INTERFERENCE

• C.

INTERFERENCE

• D.

OUT OF PHASE WAVES

C. INTERFERENCE
Explanation
When two waves arrive at a location at the same time, interference occurs. Interference is the phenomenon where the waves interact with each other, resulting in a combination of their amplitudes. Depending on the phase relationship between the waves, interference can be constructive, where the amplitudes add up, or destructive, where the amplitudes cancel each other out. The given answer, "INTERFERENCE," correctly identifies the events that take place when waves of different amplitude arrive at a location simultaneously.

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• 29.

### SOUND CAN BE CHARACTERIZED AS:

• A.

ENERY FLOWING THROUGH A VACUME

• B.

A VARIABLE

• C.

CYCLICALS OSCILLATIONS IN CERTAIN VARIABLES

C. CYCLICALS OSCILLATIONS IN CERTAIN VARIABLES
Explanation
The correct answer is "CYCLICALS OSCILLATIONS IN CERTAIN VARIABLES". Sound can be characterized as cyclical oscillations in certain variables because it is a form of energy that travels in waves, causing particles in a medium to vibrate back and forth. These vibrations create compressions and rarefactions, resulting in the perception of sound. The variables involved in sound include amplitude (loudness), frequency (pitch), and wavelength.

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