Electromagnetic Waves Quiz

Which of the following is true for sound waves?

• They require a medium. (介质）

• They are unrelated to vibrations. （振动）

• They cannot travel through liquids

• They can travel in a vacuum （真空）

2. A student asks a series of questions about a wave. The answer to which question will allow the student to determine whether the wave is electromagnetic or mechanical? 以下哪个问题能够帮助学生确定哪一种波是机械波，哪一种是电磁波？

• Does it require a medium in order to travel?

• Can it pass through air and water?

• Does it have a measurable speed?

• Does it have a measurable frequency?

Which distance represents the wavelength?

• W

• X

• Y

• Z

Which distance represents the amplitude?

• W

• X

• Y

• Z

What do radio waves, microwaves, X-rays, and gamma rays all have in common?

• They all have the same wavelength.

• They are electromagnetic waves.

• They are detected in the same way.

• They store the same amount of energy.

How many wavelengths separate point A and point B?

• 1.5

• 2

• 2.5

• 3

Point A represents what?

• Trough

• Midpoint

• Crest

• Node

Which wave has a greater frequency?

• A

• B

If a wave has a greater frequency, what happens to the wavelength?

• Increases

• Decreases

• Stays the same

What is the amplitude of this wave?

• 2

• 3

• 6

• 10