Unit Test — Unit test Answers

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1
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What is occurring when two waves traveling along the same medium meet and cancel each other out?

A
destructive interference
B
constructive interference
C
reflection
D
refraction
3

If humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?

A
Ultraviolet light detects the presence of radioactive substances.
B
Ultraviolet light shows cold areas as blue and warm areas as red.
C
Ultraviolet light causes substances to fluoresce and give off visible light.
D
Ultraviolet light transmits information to AM and FM radio receivers.
4

Which example would contain only longitudinal waves?

A
a crowd doing the wave at a sporting event
B
an ultrasound that transmits soundwaves
C
the waves formed by the ocean
D
playing the guitar strings
7

Which equation should be used to calculate the speed of a wave?

A
speed = frequency x wavelength
B
speed = frequency x hertz
C
speed = period x wavelength
D
speed = period x hertz
8

Sound waves are produced when something is caused to

A
reflect.
B
vibrate.
C
slow down.
D
get warmer.
9

After the 1600s, how did observations of light being refracted change the way most scientists thought about light?

A
They no longer believed that light acted as waves.
B
They began to believe that light acted as waves.
C
They no longer believed that light acted as particles.
D
They began to believe that light acted as particles.
10

Which statement best describes how waves carry energy?

A
Energy moves from one place to another through the wave.
B
Energy increases as it moves through the wave.
C
Energy is completely consumed by the beginning of the wave.
D
Energy builds through the wave and is released at the end.
12

Which best describes how wave intensity and loudness are typically related?

A
Increased intensity means decreased loudness.
B
Increased intensity means increased loudness.
C
Intensity is related to wave amplitude, not loudness.
D
Intensity is related to wave speed, not loudness.
13

When sound is created, it travels to the ear through a

A
compression.
B
medium.
C
rarefaction.
D
surface.
14

Henri draws a wave that has a 4 cm distance between the midpoint and the trough. Geri draws a wave that has an 8 cm vertical distance from the trough to the crest.Which statement best describes the energy in Henri and Geri’s waves?

A
Henri’s wave has a higher amplitude and more energy.
B
Henri’s wave and Geri’s wave have the same amplitude and the same energy.
C
Henri’s wave and Geri’s wave have the same amplitude, but Geri’s has more energy.
D
Geri’s wave has a higher amplitude and more energy.
15

Which part of the electromagnetic spectrum has the longest wavelengths?

A
radio waves
B
gamma rays
C
infrared light
D
ultraviolet light
16

What will occur when the trough of Wave A overlaps the crest of Wave B?

A
Destructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
B
Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
C
Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
D
Constructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
17

A museum sets up a display of fluorescent minerals. Which best describes how electromagnetic waves can be used to enhance the display?

A
Infrared light shining on the minerals will cause them to give off visible light.
B
Visible light shining on the minerals will cause them to give off infrared light.
C
Ultraviolet light shining on the minerals will cause them to give off visible light.
D
Visible light shining on the minerals will cause them to give off ultraviolet light.
20

What do diffraction and refraction have in common?

A
They both involve interference.
B
They both involve wave interactions.
C
They both involve reflection.
D
They both involve construction.

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