(Savvas 18.1) Ch. 18.1 Electromagnetic Waves

Which type of wave can travel through a vacuum?

• Mechanical

• Electromagnetic

• Both

• None

Electromagnetic waves are ______ waves that consist of changing electric fields and changing magnetic fields.

• Longitudinal

• Transverse

• Circular

• Linear

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Choose the letter of each sentence that is true about electric and magnetic fields:

• A) An electromagnetic wave occurs when electric and magnetic fields vibrate at right angles to each other.

• B) A magnetic field is surrounded by an electric current.

• C) Changing electric and magnetic fields regenerate each other.

• D) Electromagnetic waves are produced when an electric charge vibrates.

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Electric fields are produced by electrically charged particles and by changing ______.

• Magnetic fields

• Sound waves

• Light waves

• Water waves

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Which type of wave is a transverse wave?

• Electromagnetic

• Mechanical

• Both

• None

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Electromagnetic waves are produced when a(n) ______ vibrates or accelerates.

• Electric charge

• Magnetic field

• Sound wave

• Light wave

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What are electromagnetic waves?

• Waves that need a medium

• Transverse waves with changing electric and magnetic fields

• Longitudinal waves

• Waves that cannot travel through a vacuum.

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True or False: Mechanical waves can travel through a vacuum.

• True

• False

Choose the letter that gives the correct speed of light in a vacuum.

• 3.00 x 10^8 kilometers per second

• 3.00 x 10^8 meters per hour

• 3.00 x 10^8 meters per second

• 3.00 x 10^8 kilometers per hour

Choose the letter of each sentence that is true about electromagnetic waves.

• Different electromagnetic waves can have different frequencies.

• Wavelength is directly proportional to frequency.

• Electromagnetic wave's instantaneous speed is always the speed of light.

• All electromagnetic waves travel at the same speed in a vacuum.

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