AnswersCrowley Credit Recovery Physics BIntroduction to Waves

Introduction to Waves Answers

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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
2
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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.
3

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.
4

Ten students stand in a circle and are told to make a transverse wave. What best describes the motion of the students?

A
Each student bumps the shoulder of his or her neighbor.
B
At the exact time, all students take a step to the right.
C
The students skip clockwise, going in a circular motion.
D
One at a time, each student lifts his or her hands up and then down.
5

Which are examples of transverse waves? Check all that apply.

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

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.
7

A student is performing an experiment comparing sound and light waves. The student gathers the following data.

Question illustration
A
Light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through.
B
All sound waves always have the same energy, so the temperature of the medium does not affect wave speed.
C
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.
D
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.
8

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
9

What describes the wave used? Check all that apply.

A
transverse
B
longitudinal
C
heat
D
electromagnetic
E
sound
10

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