# Using Your Text, Notes, Assignments, Labs, and Each Other, Answer the Following Questions

Light, Color, R & R Mega-Review

Using your text (look it up!), notes, assignments, labs, and each other, answer the following questions on a separate sheet as a review. Completion of this review will count as part of your test grade.

Light

1. What is light? How does it originate?

2. Sketch your own representation of the electromagnetic spectrum. Indicate different divisions and the physical

difference of the waves in those divisions.

3. Which of the following does not belong? Radio waves, light waves, sound waves, microwaves, x-rays. Explain

4. Which has longer wavelengths, radio waves or gamma rays?

5. Which has higher frequencies, ultraviolet waves or gamma rays?

6. What is the physical difference between red and blue light?

7. What is the speed of light?

8. A light year is the distance light travels in a time of one year. Calculate a light-year.

9. The second nearest star to earth is Alpha Centauri, which is 4 light years away. How long does it take light to

reach us from Alpha Centauri?

10. If a radio wave has a wavelength of 100m, what is it’s frequency? (use the wave equation!)

11. If an x-ray has a wavelength of 1x10-9m, (0.000000001m), what is it’s frequency?

Color

1.   What color appears when blue and green spotlights overlap on a white screen?

2.   What determines the color that an opaque object appears? What determines the color a transparent object appears? (draw picture to help explain)

3.   Define complementary colors and give two examples.

4.   What colors produce cyan? Magenta? Yellow?

5.   Which range of light frequencies, visible or ultraviolet, are absorbed in glass? Which range are transmitted?

6.   Is white a color? Is black? Explain.

7.   What color clothing is “coolest” on hot days? Explain why. What color is “warmest”? Why?

8.   What is the difference between an object that appears red and one that appears blue?

9.   What color would a red car appear to be if it were under a lamp that emitted only blue light? Explain.

10.   List the order of colors in the color spectrum.

R & R

1. Use words and pictures to explain the law of reflection.

2. For each of the drawings below, draw the normal and extend the light ray into the air or into the water.

3. Use a drawing and words to explain angle of incidence.

4. Use a drawing and words to explain angle of refraction.

5. When light goes from air into water, is the angle of refraction greater than the angle of incidence? Explain your answer.

6. When light goes from water to air, is the angle of refraction greater than the angle of incidence? Explain your answer.

7. true or false: Light always bends when it goes from air into water. Explain your answer.

8. true or false: Light always bends when it goes from water into air. Explain your answer.

9. A person standing in a swimming pool appears to have very short legs. Draw a ray diagram to show how this illusion occurs.

10. If an eighth grade student asked you, “What is refraction of light?”, how would you answer?