AnswersCrowley Credit Recovery Physics BIntroduction to Waves

Introduction to Waves Answers

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1
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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
2
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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
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

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.
5

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.
6

A pebble is dropped in a pond.

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

What type of wave is a microwave?

A
heat
B
longitudinal
C
sound
D
transverse
9

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.
10

Which statements best describe X-rays? Check all that apply.X-rays are electromagnetic waves.X-rays are longitudinal waves.X-rays are mechanical waves.X-rays are transverse waves.X-rays travel at the speed of light.X-rays travel at the speed of sound.

A
X-rays are electromagnetic waves.
B
X-rays are longitudinal waves.
C
X-rays are mechanical waves.
D
X-rays are transverse waves.
E
X-rays travel at the speed of light.
F
X-rays travel at the speed of sound.

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