Answers25-26 TX-Physics B-CRUnit Test

Unit Test — Unit test Answers

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1
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Study the diagram.

Question illustration
A
A: crestB: amplitudeC: wavelengthD: trough
B
A: troughB: amplitudeC: crestD: wavelength
C
A: troughB: amplitudeC: wavelength D: crest
D
A: crestB: amplitude C: trough D: wavelength
2
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In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge. This resulted in a large movement of roadway, which eventually caused the bridge to fail.

A
absorption, because the bridge absorbed all the energy of the wind
B
diffraction, because the wind moved around the bridge, which set the bridge into motion
C
interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge
D
interference, because destructive interference occurred when the wind frequency matched the natural frequency of the bridge
3

A sound wave travels through water. What best describes the direction of the water particles?

A
The water particles move perpendicular to the source of the sound wave.
B
The water particles move in the same direction as the vibrating source of the sound wave.
C
The water particles move in random patterns because the sound is diffracted in many directions.
D
The water particles do not move because the sound wave does not have enough energy.
4

If a soundproof door is almost shut but still leaves a small opening, what wave phenomenon is responsible for someone being able to hear sound from the room while standing by the wall to the side of the opening?

A
absorption
B
diffraction
C
reflection
D
refraction
5

Which are examples of transverse waves? Check all that apply.earthquake P-wavesearthquake S-wavesradio waves soundvisible lightX-rays

A
earthquake P-waves
B
earthquake S-waves
C
radio waves
D
sound
E
visible light
F
X-rays
6

What two factors affect the speed of a sound wave as it travels through a medium?

A
the energy transferred by the wave and the density of the medium
B
the type of medium and the energy transferred by the wave
C
the type of medium and the temperature of the medium
D
the temperature of the medium and the energy transferred by the wave
7

Sound travels slowest through what temperature of water?

A
20°C
B
40°C
C
60°C
D
80°C
8

Sunlight is shown filtering through clouds.What wave phenomenon is responsible for the sunlight shown in this diagram?

Question illustration
A
diffraction, because light is bent around the clouds
B
refraction, because the light bends through the clouds
C
absorption, because the sunlight is absorbed by the clouds
D
transmission, because the sunlight travels through the clouds
9

Sound will travel slowest through which medium?

A
water at 55°C
B
water at 75°C
C
ice at 0°C
D
ice at –25°C
10

When a DVD is played, a laser light hits the surface of the disk and then returns to the detector.

Question illustration
A
absorption
B
interference
C
reflection
D
refraction
11

The speed of sound in ice, water, and steam is shown.

Question illustration
A
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
B
Sound travels slowest in steam because the sound has to move around the gas molecules that are far apart.
C
Sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy.
D
Sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.
12

absorptiondiffractionreflectionrefraction

A
absorption
B
diffraction
C
reflection
D
refraction
13

A sound wave has a frequency of 425 Hz. What is the period of this wave?

A
0.00235 seconds
B
0.807 seconds
C
425 seconds
D
850 seconds
14

Two wave pulses move toward each other along a rope.

Question illustration
A
A straight line.
Option A
B
A triangular crest.
Option B
C
A rectangular crest.
Option C
D
A triangular trough.
Option D
15

Consider this image of a wave.

Question illustration
A
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes up to .8, back down through .75 s and all the way down to 2 before going back up to 2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option A
B
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1 s and all the way up to .7 before going back down to .2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option B
C
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to .6, back up through 1s and all the way up to .6 before going back down to .4 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option C
D
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1s and all the way up to .7 before going back down to .2 on the other side of the x axis. Then back up to .3 on the other side of the x axis. The pattern repeats itself but flipped on the x axis
Option D
16

Color is a result of the absorption and reflection of light. A shirt appears a color because it reflects that color of light. A shirt appears black when it absorbs all wavelengths of light.

A
The light is transmitted through the shirt, so no color appears.
B
The shirt absorbs the sunlight, so it appears white.
C
All the light is reflected, so the shirt appears white.
D
The sunlight refracts when it hits the shirt, so the shirt appears white.
17

The diagrams show the sound waves produced in one second from various tuning forks.Which sound wave has the lowest pitch?

A
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.
Option A
B
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again. The line pattern then repeats.
Option B
C
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats.
Option C
D
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats. The farther apart section gets wider the further the lines are from the fork.
Option D
18

What factors affect the speed of a wave? Check all that apply.the amplitude of the wavethe energy of the wavethe temperature of the mediumthe type of wavethe type of medium

A
the amplitude of the wave
B
the energy of the wave
C
the temperature of the medium
D
the type of wave
E
the type of medium
19

An FM radio station broadcasts at 9.23 × 107 Hz. Given that the radio waves travel at 3.00 × 108 m/s, what is the wavelength of these waves?

A
0.308 m
B
2.77 m
C
3.25 m
D
6.50 m
20

In an experiment, a ringing bell is placed in a vacuum jar that does not have any air in it. What best describes why the bell is seen vibrating but not heard?

A
Light waves have high frequencies and are able to pass through the vacuum jar, but the frequencies of sound waves are too low to vibrate a vacuum.
B
Light waves travel faster than sound waves, so they are able to travel through the vacuum jar, but sound waves do not have enough energy to vibrate glass.
C
Light does not need a medium to travel through, but since sound waves must have a medium to vibrate, sound is not created where no air is present.
D
Light is a longitudinal wave that is able to pass through the vacuum jar, but sound is a transverse wave that has to move perpendicular to air.

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