AnswersPhysicsWaves I

Waves I — Test Answers

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1
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What is the direction of the Slinky wire at Point P as the waves travel through this point?

A
Image with description A dot vector drawn up and vector drawn down.
B
Image with description A dot with a vector drawn up to the left and a vector drawn down to the right.
C
Image with description A dot with a vector drawn right and a vector drawn left.
D
Image with description A dot with a vector drawn up to the right and a vector drawn down to the left.
2
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What part of the wave determines how much energy it has?

A
wavelength
B
velocity
C
amplitude
D
period
3

What conclusion does the student most likely make based on this data?

A
Light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through.
B
Light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas.
C
Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.
D
All sound waves always have the same energy, so the temperature of the medium does not affect wave speed.
4

Identify point B.

A
amplitude
B
crest
C
wavelength
D
trough
5

Which lists the amplitudes of sound waves from these sources in order from greatest to least?

A
chainsaw, diesel truck, rustling leaves
B
library, conversational speech, music from speaker
C
busy roadway, kids whispering, average home
D
kids whispering, vacuum cleaner, jet airplane
6

Which best describes the type of wave seen here?

A
longitudinal, because the water molecules move up and down, which is perpendicular to the motion of the wave
B
longitudinal, because the water molecules move up and down, which is parallel to the motion of the wave
C
transverse, because the water molecules move up and down, which is parallel to the motion of the wave
D
transverse, because the water molecules move up and down, which is perpendicular to the motion of the wave
7

What is the amplitude of this wave?

A
2 point 1 cm
B
2 point 6 cm
C
1 point 3 centimeters
D
4 point 2 cm
8

Which are examples of resonance? Choose three correct answers.

A
the volume on a stereo being turned up
B
an opera singer breaking a glass with her voice
C
a person pushing a swing at the rate it naturally oscillates back and forth
D
a note being played on a saxophone
E
an echo
10

_______interference occurs when two waves overlap and the resulting wave has a larger amplitude.

A
Refraction
B
Constructive
C
Destructive
D
Reflection
11

What is the SI unit for intensity?

A
mel
B
joule
C
decibel
D
watt
12

Visible light travels at a speed 3 point 0 times 10 to the 8th power of m over s If red light has a wavelength of 6 point 5 times 10 to the negative 7 power m , what the frequency of this light?

A
3 point 0 times 10 to the 8th power Hz
B
2 point 0 times 10 squared Hz
C
4 point 6 times 10 to the 14th power Hz
D
2 point 2 times 10 to the negative 15 power Hz
13

Which is the best example of the wave phenomenon called transmission?

A
Sound is heard around an open doorway.
B
An image of a tree is seen is on the surface of a smooth lake.
C
A coin seems smaller at the bottom of a swimming pool.
D
A street is seen through a window.
14

What best describes a possible transfer of energy?

A
A mechanical wave transfers energy through matter.
B
A longitudinal wave transfers energy perpendicular to wave motion.
C
A transverse wave transfers energy parallel to wave motion.
D
A sound wave does not need a medium to transfer energy through.
15

Which best explains why sound travels fastest through a solid?

A
Sound is an electromagnetic wave, so a greater amplitude results in a greater speed.
B
Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.
C
Sound is a mechanical wave, so if the volume of the medium is greater, more energy is transferred.
D
Sound is an electromagnetic wave, so the medium does not affect the speed.
16

Which best describes the energy of a sound wave as it travels through a medium?

A
It depends on the medium.
B
It increases.
C
It remains the same.
D
It decreases.
17

What best describes the refraction of light rays?

A
light getting brighter when two waves combine
B
light passing through a clear glass window
C
light bouncing off of a mirror
D
light bending when it passes through a lens
18

Which best describes loudness?

A
the subjective measurement of the intensity of sound
B
an inherent measurement of the intensity of sound
C
the subjective measurement of the wavelength of a sound wave
D
an inherent measurement of the wavelength of a sound wave
19

The ______ is the time it takes for a wave to complete one cycle.

A
trough
B
period
C
frequency
D
hertz
20

Ultraviolet light from a distant star is traveling at 3.0 meters meters per second How long will it take for the light to reach Earth if it must travel 4 point 0 times 10 to the 13th power kilometers ?

A
2 point 7 times 10 to the negative 2 power hours
B
1 point 3 times 10 to the 5th power hours
C
3 point 7 times 10 to the 4th power hours
D
2 point 2 times 10 cubed hours
21

A car’s horn produces a constant frequency of 350 Hz as it passes by Suzy. What is the best estimate of the frequency Suzy hears after the car passes her?

A
330 Hz
B
350 Hz
C
360 Hz
D
700 Hz

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