Electromagnetic Radiations

All of the following are examples of electromagnetic waves except

• sound waves

• microwaves

• gamma rays

• infrared light

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An electromagnetic wave begins when a(n)

• atom loses an electron

• magnet is connected to a battery

• charged particle vibrates

• electron is magnetized

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Which of the following waves does not require a medium?

• ocean waves

• earthquake waves

• sound waves

• radio waves

Most of the electromagnetic radiation on Earth comes from

• the sun

• radio towers

• X ray machines

• microwave ovens

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How long does it take electromagnetic radiation to reach Earth from the sun?

• 1 second

• 7.5 seconds

• 8 minutes

• 93 minutes

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Which electromagnetic waves are used for cell phone signals?

• X rays

• microwaves

• gamma rays

• none of the above

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What color does the shortest wavelength of visible light appear to the human eye?

• red

• yellow

• orange

• violet

Uses of electromagnetic radiation include

• cooking

• communications

• medicine

• all of the above

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Electromagnetic waves with the lowest frequencies may have wavelengths as long as

• many kilometers

• a few meters

• a couple of centimeters

• a fraction of a millimeter

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What statement about electromagnetic waves is true?

• An electromagnetic wave with a shorter wavelength has a lower frequency

• All electromagnetic waves travel at the same speed across space

• All electromagnetic waves are harmful

• none of these are true.

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