Answers26-27 IC Physics 7614BWave Interactions

Wave Interactions — Unit test Answers

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Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point P at the same instant.

Question illustration
A
An illustration with the triangular trough in the middle of the rectangular crest to the left of point P.
Option A
B
An illustration with the triangular trough in the middle of the rectangular crest to the right of point P.
Option B
C
An illustration with a rectangular crest moving toward the right past P and a triangular trough going toward the left past P.
Option C
D
An illustration with a rectangular crest moving toward the left and a triangular trough going toward the right both away from point P and equidistant from P.
Option D
2
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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.
3

Sound travels slowest through what temperature of water?

A
20°C
B
40°C
C
60°C
D
80°C
4

Juan is standing on the street. An ambulance moves toward him and then passes by.

A
The pitch remains constant as the ambulance moves toward and then away from Juan.
B
The pitch increases and decreases in a repeated pattern as the ambulance passes Juan.
C
The pitch drops to a lower pitch once the ambulance passes by Juan.
D
The pitch increases to a higher pitch once the ambulance passes by Juan.
5

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
6

SONAR stands for "sound navigation and ranging,” and it is used to map and explore the ocean floor.

A
transverse and electromagnetic
B
transverse and mechanical
C
longitudinal and electromagnetic
D
longitudinal and mechanical
7

What is the purpose of a rearview mirror in a car?

A
The mirror allows the light to be absorbed so the driver will not see any glare.
B
The mirror allows the light to interfere so the light waves combine to form an image.
C
The mirror allows the light to be reflected so the objects behind the car can be seen.
D
The mirror allows the light to be transmitted so the light will not reach the driver's eyes.
8

A marching band is practicing. The band director sees the drum major hit a drum. How far away is the director if he hears the drumbeat in 0.40 seconds? The speed of sound is 330 m/s.

A
12 m
B
132 m
C
264 m
D
825 m
9

A wave is produced in a Slinky as shown.What is the direction of the Slinky wire at Point P as the waves travel through this point?

Question illustration
A
A dot with a vector drawn right and a vector drawn left.
Option A
B
A dot vector drawn up and vector drawn down.
Option B
C
A dot with a vector drawn up to the right and a vector drawn down to the left.
Option C
D
A dot with a vector drawn up to the left and a vector drawn down to the right.
Option D
10

What describes the wave used? Check all that apply.

A
transverse
B
longitudinal
C
heat
D
electromagnetic
E
sound
11

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
12

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
13

What best describes the refraction of light rays?

A
light bouncing off of a mirror
B
light bending when it passes through a lens
C
light getting brighter when two waves combine
D
light passing through a clear glass window
14

How are electromagnetic waves different than all other waves?

A
They can be transmitted.
B
They can be reflected.
C
They can vibrate matter.
D
They can travel through space.
15

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

A
diffraction
B
Doppler effect
C
reflection
D
resonance
16

When two waves are in sync with each other and occupy the same place at the same time, how is the resulting wave determined?

A
by averaging the wavelengths of the two waves
B
by dividing the frequencies of the two waves
C
by multiplying the velocities of the two waves
D
by adding the amplitude of the two waves
17

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
18

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
19

What are examples of devices that use electromagnetic waves? Check all that apply.FM radiosmicrowavesTV remote controlsalarm clocksX-rays

A
FM radios
B
microwaves
C
TV remote controls
D
alarm clocks
E
X-rays
20

A wave has a wavelength of 4.9 m and a velocity of 9.8 m/s. The medium through which this wave is traveling is then heated so that the velocity is doubled.If the frequency remains constant, what is the wavelength of the heated wave?

A
2.5 m
B
9.8 m
C
14.7 m
D
19.6 m

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