Q: A medical imaging device uses electromagnetic waves with a frequency of $$5 \times 10$$^{14}$$\ \mathrm{Hz}. If $$the speed of light is $$3 \times 10^8$\ \mathrm{m/s}$$, what is the wavelength of the waves used? (Use $$c = \lambda \nu)$$

$$6 \times 10$$^{-7}$$\ \mathrm{m}$$

Q: If a wave has a frequency of $$2 \times 10$$^{15}$$\ \mathrm{Hz}$$ and a wavelength of $$1.5 \times 10$$^{-7}$$\ \mathrm{m}$$, what is the speed of the wave?

$$3 \times 10^8$\ \mathrm{m/s}$$

Question 1

Which term describes the highest point of a wave, as shown in the diagram of an electromagnetic wave?

Accepted Answer

Crest

Question 2

What is the speed of light in a vacuum, as given in the study materials?

Accepted Answer

$$1,000,000$$

Question 3

The distance from one crest of a wave to the next crest is called the:

Accepted Answer

Wavelength

Question 4

Which of the following best describes the relationship between wavelength and frequency for electromagnetic waves?

Accepted Answer

They are inversely proportional.

Question 5

If the frequency of a wave increases, what happens to its wavelength and energy?

Accepted Answer

Wavelength decreases, energy increases.

Question 6

Which of the following is the correct unit for frequency?

Accepted Answer

$$\mathrm{Hz}$$

Question 7

Given three electromagnetic waves, I, II, and III, with the following wavelengths: I = $$400\ \mathrm{nm}$$, II = $$700\ \mathrm{nm}$$, III = $$550\ \mathrm{nm}$$, which wave has the highest frequency?

Accepted Answer

Wave I

Question 8

If the wavelength of a light wave is doubled, what happens to its frequency (assuming the speed of light remains constant)?

Accepted Answer

It is halved.

Question 9

Which of the following equations correctly relates the speed of light ($$c$$), wavelength ($$\lambda$$), and frequency ($$
u$$)?

Accepted Answer

$$c = \lambda 
u$$

Question 10

A medical imaging device uses electromagnetic waves with a frequency of $$5 	imes 10$$^{14}$$\ \mathrm{Hz}. If $$the speed of light is $$3 	imes 10^8$\ \mathrm{m/s}$$, what is the wavelength of the waves used? (Use $$c = \lambda 
u)$$

Accepted Answer

$$6 	imes 10$$^{-7}$$\ \mathrm{m}$$

Question 11

Which part of the electromagnetic wave is labeled as the 'trough'?

Accepted Answer

The lowest point of the wave

Question 12

A student claims that increasing the frequency of light will decrease its energy. Is this statement correct? Why or why not?

Accepted Answer

No, because energy and frequency are directly related.

Question 13

Which of the following best describes the relationship between energy, frequency, and wavelength for electromagnetic radiation?

Accepted Answer

Energy increases as frequency increases and wavelength decreases.

Question 14

If a wave has a frequency of $$2 	imes 10$$^{15}$$\ \mathrm{Hz}$$ and a wavelength of $$1.5 	imes 10$$^{-7}$$\ \mathrm{m}$$, what is the speed of the wave?

Accepted Answer

$$3 	imes 10^8$\ \mathrm{m/s}$$

Question 15

Which of the following statements is true regarding the electromagnetic spectrum?

Accepted Answer

Waves with shorter wavelengths have higher frequencies.

Question 16

A hospital uses ultraviolet light to sterilize equipment. Compared to visible light, ultraviolet light has:

Accepted Answer

Shorter wavelength and higher frequency.

Electromagnetic Radiation: Properties of Light Waves

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