AnswersCrowley Credit Recovery Physics BIntroduction to Waves

Introduction to Waves Answers

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1
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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.
2
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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.
3

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
4

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
5

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.
6

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
7

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
8

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.
9

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.
10

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

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