Dr. Potts 7th Grade - Unit 7 Test Review

Which electromagnetic waves have the highest frequencies and the shortest wavelengths?

• microwaves
• visible light
• gamma rays

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Which electromagnetic waves are used in ovens and cell phone communications?

• Infrared rays
• ultraviolet rays
• microwaves

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Which type of waves are used in broadcasting?

• radio waves
• infrared rays
• x-rays

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Electromagnetic waves that help your body produce vitamin D are called?

• ultraviolet rays
• x-rays
• gamma rays

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For waves in any medium, as the wavelength decreases, what happens to the frequency?

• It also decrease
• It stays the same
• It increases

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What happens when light is refracted?

• It changes direction

• It becomes invisible

• It releases heat

• It moves faster

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What happens to the speed of light as it exits the air and enters a glass of water?

• It speeds up

• It remains constant

• It slows down

• It first slows down and then speeds up

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This drawing illustrates the ________________________ of a light wave.

• refraction

• reflection

• diffraction

• dispersion

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Sound waves travel as ________ waves.

• Transverse

• Longitudinal

• Surface

Sound is made when a source of energy forces the matter to

• Vibrate

• Move

• Stay still

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