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Homework exercises on Visible Light for a Physical Science course.  Also refer to optics, physics, lasers, colors, vision, cameras, spectrum,  WBT, education, distance learning, Ron Kurtus, School for Champions. Copyright © Restrictions

Light - Homework Answers

After you have completed the Light Homework, you can refer to these answers. Although it is better to have known the answer from your reading, the process of writing the correct answer on your homework sheet will help you remember the concepts.

1. Name three devices used to detect visible light.

Photographic film, solar cell, electric eye, human eye, etc.

2. Name three sources of light.

Fire, the Sun, light bulb, lightning, etc.

3. What are the four major characteristics of a light wave? (Hint: the same as for sound).

Wavelength, frequency, amplitude, velocity.

4. Approximately, how fast does light travel in miles per second? In kilometers per second?

.186,000 miles/s or 300,000 km/s.

5. Is a light wave a transverse or compression wave?

Transverse.

6. What is polarization of light?

Selective filtering in on direction.

7. Give an example of a use for a Polaroid filter.

Polaroid sunglasses, camera filter, 3-d movies, stress testing.

8. What is the relationship between light, electricity and magnetism?

Light is an electro-magnetic wave.

9. What is the relationship between visible light and microwaves?

.Microwaves have a longer wavelength than visible light.

10. Are there any other light waves besides what we see? If so, name three such waves or rays.

.Radio waves, TV waves, microwaves, X-rays, Gamma waves, infra-red, ultraviolet.

11. What is refraction of light?

Bending of light when it goes from one medium to another--like from air to glass.

12. What happens when light passes from air into water?

.It refracts. Also, it slows down. Some is reflected and a little is absorbed..

13. How is the human eye similar to a camera? (Draw a picture)

Both have a lens and a film-like substance to detect the light.

14. What are the colors of the visible spectrum? (Hint: remember a man's name.)

ROY G BIV red, orange, yellow, green, blue, indigo, violet

15. What can be used to separate light into its colors?

A prism

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