Electric Charge Answers

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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

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

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
6

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.
7

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.
8

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.
12

What do digital signals turn sounds into?

A
analog signals
B
interference
C
continuity
D
zeros and ones
13

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

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

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