The Nature of Electromagnetic Waves

Radio waves are:

• short wavelength electromagnetic waves.

• short wavelength sound waves.

• long wavelength electromagnetic waves.

• long wavelength sound waves.

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Electromagnetic radiation is classified as a transverse wave because:

• it travels through a vacuum.

• it travels at the speed of light.

• the electric and magnetic waves are perpendicular to each other.

• the vibrations are perpendicular to the direction of propagation.

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A radio wave:

1) travels at the speed of sound.

2) is received by a radio which increases the amplitude of

the wave.

3) is low energy electromagnetic radiation.

Which of these statements is TRUE?

• 1 only.

• 1 and 2 only.

• 2 and 3 only.

• 3 only.

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The dual nature of electromagnetic radiation applies to:

• all electromagnetic radiation all the time.

• only electromagnetic frequencies above those of infrared radiation all of the time.

• all electromagnetic radiation when it interacts with materials such as metals.

• visible light only all of the time because its particles are called photons.

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which of the following lists shows EMR correctly arranged in order of increasing frequency?

• gamma rays, X-rays, microwaves, radio waves.

• X-rays, gamma rays, microwaves, radio waves.

• microwaves, radio waves, X-rays, gamma rays.

• radio waves, microwaves, X-rays, gamma rays.

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Which of the following occurs when the wavelength and the amplitude of EMR passing through a vacuum, is increased?

• The frequency decreases and the intensity increases.

• The frequency and the intensity increases.

• The frequency and the intensity decreases.

• The frequency increases and the intensity decreases.

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Which of the following affects the energy of the photons of EMR?

• amplitude

• period

• frequency

• the medium through which it passes.

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Calculate the energy of the photons in a type of electromagnetic radiation if the frequency is 4,5 x 10¹⁸ Hz.

• 2,98 X 10¹⁵ joules

• 1,47 x 10^-52 joules

• 6,79 x 10⁵¹ joules

• 2,98 X 10^-15 joules

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What two properties of EMR below prove the wave- like nature of EMR?

• can travel through a vacuum.

• interference.

• travels at the speed of light.

• reflection.

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Which of the following types of EMR is used to send a signal from a TV remote control device to change the channel on a TV?

• radio waves

• microwaves

• infrared

• X-ray

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