Chapter 22 Sample Multiple Choice Problems

1.       All electromagnetic waves travel through a vacuum at

a.   the same speed.

b.   speeds that are proportional to their frequency.

c.   speeds that are inversely proportional to their frequency.

          d.   None of the above.

2.       Electromagnetic waves are

a.   longitudinal.

b.   transverse.

c.   both longitudinal and transverse.

          d.   None of the above.

3.       The E and B fields in electromagnetic waves are oriented

a.   parallel to the wave's direction of travel, as well as to each other.

b.   parallel to the waves direction of travel, and perpendicular to each other.

c.   perpendicular to the wave's direction of travel, and parallel to each other.

d.   perpendicular to the wave's direction of travel, and also to each other.

4.       An electromagnetic wave is radiated by a straight wire antenna that is oriented vertically. 
What should be the orientation of a straight wire receiving antenna?  It should be placed

a.   vertically.

b.   horizontally and in a direction parallel to the wave's direction of motion.

c.   horizontally and in a direction perpendicular to the wave's direction of motion.

          d.   None of the above.

5.       An electromagnetic wave is traveling to the east.  At one instant at a given point its E vector
points straight up.  What is the direction of its B vector?

          a.  north

b.  down

          c.  east

          d.  south

6.       Which of the following correctly lists electromagnetic waves in order from longest to shortest
wavelength?

a.   gamma rays, ultraviolet, infrared, microwaves

b.   microwaves, ultraviolet, visible light, gamma rays

c.   radio waves, infrared, gamma rays, ultraviolet

d.   television, infrared, visible light, X-rays

7.       What is the wavelength of light waves if their frequency is 5.0X10¹⁴ Hz?

a.   0.60 m

b.   6.0 mm

c.   0.060 mm

d.   0.60 micro-m

8.       How long does it take light to travel 1.0 m?

          a.   3.3 ns

b.   3.3 micro-s

c.   3.3 ms

          d.   3.3 s

9.       What is the wavelength of a 92.9 MHz radio wave?

a.   32 mm

b.   32 cm

c.   3.2 m

d.   32 m

10.     What frequency are 20 mm microwaves?

a.   100 MHz

b.   400 MHz

c.   15 GHz

d.   73 GHz

Answers

1. a

2. b

3. d

4. a

5. d

6. d

7. d

8. a

9. c

10. c