Chapter 12 8th Grade Science Electromagnetic Sprectrum

The speed of electromagnetic waves is ____.

• greater in water than in air

• less for light than for X rays

• 300,000 km/s in a vacuum

• different for each frequency in a

  vacuum

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Oscillating electrons generate changing ____ fields.

• magnetic

• electric

• radio

• Both electric and magnetic

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Electromagnetic waves ____.

• are compressional waves

• must have a medium

• are transverse waves

• are generated by static electricity

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The ____ is the particle that carries radiant energy.

• photon

• electron

• neutron

• proton

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The ____ of light determines whether a radiation will eject electrons.

• frequency

• amplitude

• intensity

• speed

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Electromagnetic radiation with the shortest wavelengths is ____.

• gamma rays

• ultraviolet waves

• radio waves

• infrared waves

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The electromagnetic waves with wavelengths slightly longer than visible light are ____.

• X rays

• infrared waves

• microwaves

• ultraviolet waves

The frequency of purple light is ____ that of yellow light.

• higher than

• lower than

• the same as

• faster than

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____ are used for medical imaging.

• Ultraviolet waves

• Infrared waves

• X rays

• Gamma rays

Your body needs ____ to make vitamin D.

• visible light waves

• infrared waves

• microwaves

• ultraviolet waves