Electromagnetic Waves

A wave that can travel through empty space and through matter is called an _____.

• electromagnetic wave

• radiant wave

• radio wave

• heat wave

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True or false? Warm objects emit radiation, but cool objects do not.

• True

• False

Answer explanation

All objects emit electromagnetic radiation according to their temperature. Colder objects emit waves with very low frequency (such as radio or microwaves), while hot objects emit visible light or even ultraviolet and higher frequencies.

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Energy carried by an electromagnetic wave is called _______.

• potential energy

• kinetic energy

• radiant energy

• gamma energy

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True or false? Electromagnetic waves transfer energy from one place to another, even through empty space.

• True

• False

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Waves that have a higher _______, have a higher energy.

• frequency

• wavelength

• amplitude

• magnetism

Answer explanation

Ultraviolet waves from the Sun carry enough energy to damage skin cells. Light waves from a flashlight do not carry enough energy to cause damage.

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NGSS.HS-PS4-1

The entire range of electromagnetic waves with different frequencies and wavelengths is called ____________.

• the water cycle

• electric wave cycle

• electromagnetic spectrum

• ultraviolet cycle

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A low-frequency, low-energy electromagnetic wave that has a wavelength longer than about 30 cm.

• radio wave

• microwave

• infrared wave

• gamma rays

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A _________ is a high-energy electromagnetic wave with a shorter wavelength and higher frequency than all other types of electromagnetic waves.

• radio waves

• infrared waves

• ultraviolet waves

• gamma rays

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Which electromagnetic waves have the highest energy?

• gamma rays

• light waves

• radio waves

• x-rays

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True or false? Light represents only a small portion of the total electromagnetic spectrum.

• True

• False

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