AnswersDCSS Physics CR 24-25Unit Test

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21
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As a pendulum moves closer to the equilibrium position, how do the velocity, acceleration, and force change?

A
The velocity decreases, the acceleration decreases, and the net force decreases.
B
The velocity increases, the acceleration decreases, and the net force decreases.
C
The velocity increases, the acceleration increases, and the net force decreases.
D
The velocity decreases, the acceleration increases, and the net force increases.
22
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Which best describes pitch?

A
the amount of time taken for a longitudinal wave to produce one cycle
B
the number of cycles per second perceived by the human ear
C
the amplitude of a wave when the natural frequency is matched
D
the distance between two corresponding parts of a transverse wave
23

The ______ is the time it takes for a wave to complete one cycle.

A
trough
B
period
C
frequency
D
hertz
24

All parts of the electromagnetic spectrum travel at a speed of 3 × 108 m/s when traveling through no medium. A "vacuum” means that there is no medium, such as a tube without any air in it. Therefore, 3 × 108 m/s is said to be the speed of light in a vacuum.

A
Wavelength doubles and speed doubles.
B
Wavelength doubles and speed stays the same.
C
Wavelength divides in half and speed doubles.
D
Wavelength divides in half and speed stays the same.
25

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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