Nature of Electromagnetic Waves

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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A photon with a wavelength of 6,24 x 10^-7 m is an example of -------- radiation.

• microwave

• infrared

• ultraviolet light

• gamma

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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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Radio waves are:

• short wavelength electromagnetic waves.

• short wavelength sound waves.

• long wavelength electromagnetic waves.

• long wavelength sound waves.

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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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A boy falls off his skateboard and breaks his arm.What type of radiation would be used to look at his arm and determine whether its broken or not?

ENTER YOUR ANSWER IN UPPER CASE (CAPITALS). DO NOT LEAVE ANY SPACES BETWEEN LETTERS.

What are the two kind of fields that make up an electromagnetic wave?

• Electric and sound fields

• Electric and magnetic fields

• Magnetic and longitudinal fields

• Magnetic and sound fields

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A(n) _____ consists of changing electric and magnetic fields.

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What is the speed of electromagnetic waves in a vacuum?

• About 5,170 kilometers per second

• About 1,590 kilometers per second.

• About 343 kilometers per second.

• About 300,000 kilometers per second.

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