Q: A radio station broadcasts at a frequency of $$300\ \mathrm{kHz}. $$What is the wavelength of this radio wave? (Speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$1.00 \times 10^3$\ \mathrm{m}$$

Q: What is the period of a wave with a frequency of $$6.0 \times 10^7$\ \mathrm{Hz}$$?

$$1.7 \times 10$$^{-8}$$\ \mathrm{s}$$

Q: A wave has a wavelength of $$4.68\ \mu\mathrm{m}. $$What is its frequency? (Speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$6.41 \times 10$$^{13}$$\ \mathrm{Hz}$$

Q: If the speed of light in a vacuum is $$3.00 \times 10^8$\ \mathrm{m/s}$$, what is the frequency of light with a wavelength of $$500\ \mathrm{nm}$$?

$$6.00 \times 10$$^{14}$$\ \mathrm{Hz}$$

Q: A wave travels at $$1.5 \times 10$$^{11}$$\ \mathrm{mm/s}. $$What is its speed in $$\mathrm{m/s}$$?

$$1.5 \times 10^8$\ \mathrm{m/s}$$

Question 1

Which of the following best describes electromagnetic (EM) waves?

Accepted Answer

Oscillations of electric and magnetic fields that propagate as waves through space.

Question 2

A radio station broadcasts at a frequency of $$300\ \mathrm{kHz}. $$What is the wavelength of this radio wave? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$1.00 	imes 10^3$\ \mathrm{m}$$

Question 3

Which equation correctly relates the speed $$(c)$$, frequency $$(
u)$$, and wavelength $$(\lambda) of $$electromagnetic waves?

Accepted Answer

$$c = \lambda 
u$$

Question 4

Visible light has a wavelength range of approximately:

Accepted Answer

$$400\ \mathrm{nm} to$$ $$700\ \mathrm{nm}$$

Question 5

What is the period of a wave with a frequency of $$6.0 	imes 10^7$\ \mathrm{Hz}$$?

Accepted Answer

$$1.7 	imes 10$$^{-8}$$\ \mathrm{s}$$

Question 6

Which of the following best describes diffraction?

Accepted Answer

The bending of waves as they pass through an aperture or around the corners of an object.

Question 7

A wave has a wavelength of $$4.68\ \mu\mathrm{m}. $$What is its frequency? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$6.41 	imes 10$$^{13}$$\ \mathrm{Hz}$$

Question 8

Which of the following statements about the orientation of electric and magnetic fields in an electromagnetic wave is correct?

Accepted Answer

The electric field and magnetic field are perpendicular to each other and to the direction of propagation.

Question 9

If the speed of light in a vacuum is $$3.00 	imes 10^8$\ \mathrm{m/s}$$, what is the frequency of light with a wavelength of $$500\ \mathrm{nm}$$?

Accepted Answer

$$6.00 	imes 10$$^{14}$$\ \mathrm{Hz}$$

Question 10

Which of the following best describes refraction?

Accepted Answer

The bending of light when passing from one medium to another.

Question 11

A wave travels at $$1.5 	imes 10$$^{11}$$\ \mathrm{mm/s}. $$What is its speed in $$\mathrm{m/s}$$?

Accepted Answer

$$1.5 	imes 10^8$\ \mathrm{m/s}$$

Question 12

Which of the following is a correct unit for frequency?

Accepted Answer

$$\mathrm{Hz}$$

Question 13

If two waves of equal amplitude and frequency meet in phase, what is the result?

Accepted Answer

Constructive interference, resulting in a wave with double the amplitude.

Question 14

Which of the following frequencies is within the electromagnetic spectrum?

Accepted Answer

$$10^{10}$$\ \mathrm{Hz}$$

Question 15

A wave has a period of $$2.0 	imes 10$$^{-6}$$\ \mathrm{s}. $$What is its frequency?

Accepted Answer

$$5.0 	imes 10$$^{5}$$\ \mathrm{Hz}$$

Question 16

Which of the following best explains why electromagnetic waves can travel through a vacuum?

Accepted Answer

They do not require a medium because they are oscillations of electric and magnetic fields.

Question 17

A student measures the distance between two consecutive peaks of a wave to be $$1.0\ \mathrm{mm}. $$What is this distance called?

Accepted Answer

Wavelength

Question 18

Which of the following is a real-world example of diffraction?

Accepted Answer

Hearing someone speaking around a corner.

Question 19

If the frequency of a wave is doubled while the speed remains constant, what happens to its wavelength?

Accepted Answer

It is halved.

Question 20

Which of the following best describes the amplitude of an electromagnetic wave?

Accepted Answer

The maximum strength of the electric or magnetic field.

Electromagnetic Radiation and Properties of Waves

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