Answers26-27 IC Physics 7614BWave Properties

Wave Properties — Unit test Answers

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1
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A wave is produced in a rope. The wave has a speed of 33 m/s and a frequency of 22 Hz.

A
0.67 m
B
0.75 m
C
1.5 m
D
3.0 m
2
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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
3

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
4

The image shows water passing through a barrier.

Question illustration
A
absorption
B
diffraction
C
reflection
D
refraction
5

What best describes the speed of light waves in solids, liquids, and gases?

A
The speed is fastest in solids.
B
The speed is fastest in liquids.
C
The speed is fastest in gases.
D
The speed is the same in all matter.
6

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.
7

Following a lecture on transverse and longitudinal waves, four students make Venn diagrams to characterize these waves.Which Venn diagram is correct?

A
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string, created by a disturbance and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and travel faster in a denser medium. The overlapping region has entries has speed and travels through solids.
Option A
B
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and travel faster in a denser medium. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option B
C
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, all parts of the electromagnetic spectrum, vibrating string, medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, sound and can travel through a vacuum. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option C
D
A Venn diagram with two intersecting circles. The circle on the left is labeled transverse waves with entries light, can travel through a vacuum, vibrating string and medium motion is perpendicular. The circle on the right is labeled longitudinal waves with entries medium motion is parallel, has regions of high and low density, all parts of the electromagnetic spectrum and travel faster in a denser medium. The overlapping region has entries, created by a disturbance, has speed and travels through solids.
Option D
8

A flute plays a note with a frequency of 266 Hz. What is the speed of sound if the wavelength is 1.3 m?

A
102 m/s
B
205 m/s
C
346 m/s
D
692 m/s
9

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
10

The two waves in the diagram are occupying the same place at the same time.At what time will the interfering waves have an amplitude of zero?

Question illustration
A
1.0
B
3.0
C
4.0
D
7.0
11

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.
12

The appearance of color is a result of the absorption and reflection of certain wavelengths of light. A shirt appears a certain color because it reflects that color of light. On the other hand, a shirt appears black when it absorbs all wavelengths of light and white when it reflects all wavelengths of light.

A
The temperature of the shirt will depend on how much sunlight is diffracted around the shirt.
B
The temperature of the shirt will not change because the sunlight is transmitted through the shirt to the body.
C
The temperature of the shirt will decrease because most of the light is reflected off of the shirt.
D
The temperature of the shirt will increase because all wavelengths of light are absorbed by the shirt.
13

What describes the wave used? Check all that apply.

A
transverse
B
longitudinal
C
heat
D
electromagnetic
E
sound
14

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.
15

Rohit is trying to tune an instrument. He strikes a tuning fork and then plays a note that almost matches it. Rohit hears the volume of the two waves beating, which sounds like "wah-wah-wah-wah."

A
The two waves produced have different speeds.
B
The two waves produced have different amplitudes.
C
The two waves produced have different wavelengths.
D
The two waves produced have different frequencies.
16

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
17

What best describes a sound wave?

A
transverse and electromagnetic
B
longitudinal and mechanical
C
longitudinal and electromagnetic
D
transverse and mechanical
18

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
19

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.
20

The diagram represents wavelengths of different colors of visible light that pass by in a specific time period.

Question illustration
A
red
B
yellow
C
blue
D
violet

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