PRACTICE QUIZ 16A

Answer the following questions completely and clearly.

1. Visible light is one kind of EM wave. Name four other kinds of EM waves.

  

2. Describe Michelson's speed of light experiment and the apparatus he used.

  

 

 

3. Who first predicted the existence of EM waves and that they travel at speed c in a vacuum?

  

4. Is light longitudinal or transverse? Why is it considered as such?

 

 

5. Who was Ole Roemer?

 

 

6. Which would provide greater illumination of a surface, putting in two equal bulbs instead of one or bringing the bulb twice as close? Explain.

 

 

 

7. Which would result in greater intensity, using a single 100 W bulb or two 50 W bulbs? Explain.

 

 

8. In the lab we have no direct measure of luminous intensity. How can we then determine the luminous intensity of an unknown source?

 

 

  

Solve the following. Show all work and circle your answer.

9. What is the frequency of red light having a wavelength of 700 nm? (One nm is 1.0 x 10^-9 m.)

 

 

 

10. Find the illumination 3.0 m below a 1630 lm lamp.

 

 

 

 

 

11. A screen is placed between two lamps so that they illuminate the screen equally. The first lamp has a luminous intensity of 95 cd and is 2.5 m from the screen. What is the distance of the second lamp from the screen if its intensity is 160 cd.