Sound Waves and EM Waves

One hertz is equal to:

• 1 cycle per second

• 1 amplitude

• 1 frequency

• all the cycles in the wavelength

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NGSS.MS-PS4-1

The particles in cold air have less kinetic energy than the particles in warm air. this means that they collide less often and take longer to transmit a sound wave pulse. What is this an explanation of:

• the speed of mechanical energy

• the speed of sound

• the speed of electromagnetic energy

• the speed within a vacuum

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NGSS.MS-PS4-1

Each wavefront expands in a sphere, spreading the energy across a larger area. This means that the energy per unit area of the wave decreases as it moves farther form its source, causing the loudness of the sound wave to decrease. This is an example of:

• energy of the sound wave changing as it moves farther away from the source.

• energy of the sound wave remaining constant as it moves farther away from the source.

• energy of the sound wave increases as it moves farther away from the source.

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NGSS.MS-PS4-1

NGSS.MS-PS4-2

Wavelength and Frequency are related in that...

• they are always the same

• when one increases, the other decreases (inversely proportional)

• there is no correlation

• they both vary in an irregular pattern

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NGSS.HS-PS4-1

The diagram shows a person observing a thunderstorm located several kilometers away. The person hears the thunder several seconds after seeing the lightning. Which statement accurately explains the difference in observations of sound and light by the observer?

 

• Human eyes see light faster than their ears can hear sound.

• The medium the waves are traveling through is different for each type of wave.

• Light waves travel faster than sound waves.

• Sound waves travel faster than light waves.

High frequency waves have _________ wavelengths.

• varying

• long

• the same

• short

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NGSS.MS-PS4-1

The distance between two crests or two troughs of a wave is called:

• frequency

• amplitud

• wavelength

• hertz

Which EM waves have the longest wavelength?

• radio

• x-rays

• ultraviolet

• gamma rays

Which EM waves are have the lowest frequency?

• radio

• none

• infrared

• x-rays

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NGSS.MS-PS4-2

A wave is a distrubance that transfers

• matter.

• energy.

• any state of matter.

• none of the above.

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NGSS.MS-PS4-1