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Wave Interactions — Quiz Answers

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1
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Which wave would cause destructive interference at every point of the wavelength and completely cancel out the wave?

A
Image with description A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1s and all the way up to .7 before going back down to .2 on the other side of the x axis. Then back up to .3 on the other side of the x axis. The pattern repeats itself but flipped on the x axis
B
Image with description A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to .6, back up through 1s and all the way up to .6 before going back down to .4 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
C
Image with description A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1 s and all the way up to .7 before going back down to .2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
D
Image with description A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes up to .8, back down through .75 s and all the way down to 2 before going back up to 2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
2
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Which diagram shows the resulting wave when they cross at point X?

A
Image with description A triangular crest.
B
Image with description A rectangular crest.
C
Image with description A straight line.
D
Image with description A triangular trough.
3

How will sunlight most likely affect a black shirt on a hot summer day?

A
The temperature of the shirt will increase because all wavelengths of light are absorbed by the shirt.
B
The temperature of the shirt will depend on how much sunlight is diffracted around the shirt.
C
The temperature of the shirt will not change because the sunlight is transmitted through the shirt to the body.
D
The temperature of the shirt will decrease because most of the light is reflected off of the shirt.
4

What type of wave activity is shown in the image?

A
absorption
B
diffraction
C
reflection
D
refraction
5

When two waves are in sync with each other and occupy the same place at the same time, how is the resulting wave determined?

A
by adding the amplitude of the two waves
B
by multiplying the velocities of the two waves
C
by averaging the wavelengths of the two waves
D
by dividing the frequencies of the two waves
6

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge. This resulted in a large movement of roadway, which eventually caused the bridge to fail. What characteristic of waves caused the bridge to collapse?

A
diffraction, because the wind moved around the bridge, which set the bridge into motion
B
absorption, because the bridge absorbed all the energy of the wind
C
interference, because destructive interference occurred when the wind frequency matched the natural frequency of the bridge
D
interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge
7

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. Why does a shirt appear white outside on a sunny day?

A
The sunlight refracts when it hits the shirt, so the shirt appears white.
B
The light is transmitted through the shirt, so no color appears.
C
The shirt absorbs the sunlight, so it appears white.
D
All the light is reflected, so the shirt appears white.
9

What is the purpose of a rearview mirror in a car?

A
The mirror allows the light to interfere so the light waves combine to form an image.
B
The mirror allows the light to be transmitted so the light will not reach the driver's eyes.
C
The mirror allows the light to be reflected so the objects behind the car can be seen.
D
The mirror allows the light to be absorbed so the driver will not see any glare.
10

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." What is the cause of the beats?

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

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