Unit Test — Unit test Answers

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Sound Wave A is moving through a medium that is decreasing in temperature.Sound Wave B is moving from a liquid to a gas medium.

A
They will speed up.
B
They will increase the density of their medium.
C
They will slow down.
D
They will decrease the density of their medium.
3

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.
4

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
5

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

A
compression.
B
medium.
C
rarefaction.
D
surface.
6

What do digital signals turn sounds into?

A
analog signals
B
interference
C
continuity
D
zeros and ones
9

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
10

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
11

Which part of the electromagnetic spectrum has the longest wavelengths?

A
radio waves
B
gamma rays
C
infrared light
D
ultraviolet light
12

Which two animals use echolocation?

A
bats and humans
B
bats and dolphins
C
dolphins and humans
D
dolphins and butterflies
13

Which types of waves requires matter to carry energy?

A
electromagnetic waves only
B
mechanical waves only
C
electromagnetic and mechanical waves
D
longitudinal and electromagnetic waves
15

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.
17

The frequency of a wave does not change as it passes from one medium to another.What will most likely happen if a light wave moves from the air into a solid?

A
The wavelength of the light wave will increase.
B
The speed of the light wave will decrease.
C
The wavelength of the light wave will remain the same.
D
The speed of the light wave will remain the same.
19

Sound waves are produced when something is caused to

A
reflect.
B
vibrate.
C
slow down.
D
get warmer.
20

On top a coiled spring labeled Wave A with coils, which are widely spaced then tightly spaced then widely space. On bottom a coiled spring labeled Wave B with coils, which are widely spaced then very tightly spaced then widely space.

Question illustration
A
Wave A has a lower amplitude than Wave B.
B
Wave A has a higher amplitude than Wave B.
C
Wave A has a lower frequency than Wave B.
D
Wave A has a higher frequency than Wave B.

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