Semester 2 Final Physics Review

Sound waves cannot travel in __________________.

• Empty outer space

• A railroad track

• The ocean

• Oxygen

• Sound can travel in all of the above

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When timing a track meet, you should start the time (stopwatch) when you see the smoke from the starters pistol and not when you hear it. Why?

• Compared to the speed of light, sound travels faster

• Compared to the speed of light, sound travels about the same speed

• Compared to the speed of light, sound travels slower

The source of all wave motion is a...

• harmonic object

• region of variable high and low pressure

• vibration

• movement of matter

Electromagnetic waves are

• longitudinal waves

• surface waves

• seismic waves

• transverse waves

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The distance between successive identical parts of a wave is called its

• amplitude

• wavelength

• period

• velocity

• frequency

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Why is the woman's hair affected by the Van de Graaff machine in the image?

• Every strand of hair has an opposing charge

• The hair is repelled by the woman's body

• Every strand of hair is neutral

• Every strand of hair has the same charge

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Why is it a bad idea to stand under a tall tree during a thunderstorm (lightning)?

• Electrical discharge forces are strongest when the charges are far apart

• Electrical discharge forces are the strongest when the charges are close together

• Electrical discharge forces are constant everywhere so this is just an Old Wives Tale.

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Compared to the velocity of microwaves, the velocity of gamma waves is

• faster

• slower

• the same

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A radio message is sent to astronauts on the moon. The astronaut receives the message a short time later. Which of the following explains why?

• Because the moon is orbiting the Earth

• Because there is no atmosphere and less gravity on the moon

• Because radio signals travel for a long distance

• Because the Earth is rotating about one revolution per day

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Which of the following has the longest wavelength?

• Gamma rays

• x-rays

• radio waves

• light waves

• sound waves

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