Q: What is the speed of light in a vacuum?

$$c = 3.00 \times 10^8$ \ \mathrm{m/s}$$

Q: A microwave oven uses electromagnetic waves with a wavelength of about $$12 \ \mathrm{cm}. $$What is the frequency of these waves? (Use $$c = 3.00 \times 10^8$ \ \mathrm{m/s})$$

$$f = 2.5 \times 10^9$ \ \mathrm{Hz}$$

Question 1

Which of the following statements best describes an electromagnetic wave?

Accepted Answer

It is a wave consisting of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation.

Question 2

Which region of the electromagnetic spectrum has the shortest wavelength and the highest energy?

Accepted Answer

Gamma rays

Question 3

What is the speed of light in a vacuum?

Accepted Answer

$$c = 3.00 	imes 10^8$ \ \mathrm{m/s}$$

Question 4

Which phenomenon explains why the sky appears blue during the day?

Accepted Answer

Scattering of shorter (blue) wavelengths by the atmosphere

Question 5

A beam of white light passes through a glass prism and splits into a spectrum of colors. What is this phenomenon called?

Accepted Answer

Dispersion

Question 6

Which law states that the angle of incidence is equal to the angle of reflection?

Accepted Answer

The Law of Reflection

Question 7

What is the energy of a photon with frequency $$f$$?

Accepted Answer

$$E = h f$$

Question 8

Which of the following best describes why a red shirt appears red under white light?

Accepted Answer

It reflects red wavelengths and absorbs other visible wavelengths.

Question 9

A light ray passes from air into glass at an angle. According to the law of refraction, what happens to the ray?

Accepted Answer

It bends toward the normal because light travels slower in glass.

Question 10

Which of the following is a real-world application of total internal reflection?

Accepted Answer

Optical fibers used in telecommunications

Question 11

Which of the following electromagnetic waves is most likely to cause damage to living cells?

Accepted Answer

Gamma rays

Question 12

Which equation correctly relates the speed of light $$c$$, wavelength $$\lambda$$, and frequency $$f$$?

Accepted Answer

$$c = \lambda f$$

Question 13

In Young's double-slit experiment, what causes the bright fringes on the screen?

Accepted Answer

Constructive interference of light waves from the two slits

Question 14

Which of the following best explains why you cannot see the entire electromagnetic spectrum from Earth's surface?

Accepted Answer

The atmosphere absorbs or blocks many wavelengths outside the visible and radio regions.

Question 15

A microwave oven uses electromagnetic waves with a wavelength of about $$12 \ \mathrm{cm}. $$What is the frequency of these waves? (Use $$c = 3.00 	imes 10^8$ \ \mathrm{m/s})$$

Accepted Answer

$$f = 2.5 	imes 10^9$ \ \mathrm{Hz}$$

Question 16

Which of the following is NOT a method of heat transfer?

Accepted Answer

Reflection

Question 17

Which property of light is responsible for the formation of a rainbow?

Accepted Answer

Dispersion

Question 18

What is the main reason why ultraviolet, X-rays, and gamma rays are considered harmful to living cells?

Accepted Answer

They have enough energy to ionize atoms and damage DNA.

Question 19

Which of the following best describes the dual nature of light?

Accepted Answer

Light exhibits both wave-like and particle-like properties.

Electromagnetic Waves and the Wave Nature of Light: Study Guide

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