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Electromagnetic Waves

Study Slideshow

TRUE or FALSE: A wave is an energy created by vibrations that propagate in all direction.

TRUE

5

TRUE or FALSE: Mechanical waves like earthquake waves can travel even without a medium.

FALSE

5

TRUE or FALSE: All electromagnetic waves travel at the speed of light.

TRUE

5

What do you call the part of a sinusoidal wave line which refers to the highest point of a wave?

Crest

10

What do you call the part of a sinusoidal wave line which refers to distance from one crest to the next crest or one trough to the next trough?

Wavelength

10

How fast do EM waves travel in an empty space or vacuum?

3.0 x 10⁸ m/s

10

What property of EM wave refers to number of waves that pass a fixed point in a given amount of time?

Frequency

10

What property of EM wave refers to capacity of the wave to do work?

Energy

10

Name an example of electromagnetic wave.

Any of the following: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma-rays

5

What do you call the class of EM waves with high energy and frequency which tend to become harmful to living things that are exposed to it for too long? Give one example.

Ionizing radiation (UV, X ray and Gamma rays)

10

What do you call the class of EM waves with low energy and frequency which are considered harmless to living things? Give one example.

Non-ionizing radiation (radio waves, microwaves, infrared waves, visible light)

10

Which is the only EM wave that is detectable by the human eye?

visible light

10

How can an EM wave be produced?

EM waves are produced whenever charged particles like electrons are accelerated.

15

If the frequency of EM wave increases, what will happen to its wavelength?

decrease

10

What is the relationship between frequency and energy of EM waves?

directly proportional

10

What kind of waves are used in the medical field to kill cancer cells or tumors?

gamma

10