Questions:

1. Crest A moves toward the right and meets Crest B which is moving towards the left. If Crest A has an amplitude of 2, and Crest B has an amplitude of 3, then what is the resulting amplitude at the point where the two meet
   

A) 2
B) 3
C) 5
d) 6

2. Crest A moves toward the right and meets Trough B which is moving towards the left. If Crest A has an amplitude of 3, and Trough B has an amplitude of 7, what is the resultant?

A) Crest; amplitude of 4
B) Trough; amplitude of 4
C) Crest; amplitude of 21
D) Trough; amplitude of 21

3. Crest A moves towards the right and meets Trough B which is moving towards the left. If Crest A has an amplitude of 5 and Trough B has an amplitude of 5, then the resulting amplitude is:

A) 5
B) 10
C) 25
D) 0

4. A purple light has a l of 4 ´ 10-7 meter, and a l n of 3.01 ´ 10-7 meter in a certain substance. What is the index of refraction of this substance?

A) 1
B) 1,33
C) 1,53
D) 2,42

5. If 2 light sources emit light waves of the same wavelengths and are in phase with each other they are said to be:

A) Coherent
B) Superpositioned
C) Standing
D) Resonating

6. Which of the following occur because of interference?

A) Color on soap bubbles
B) Color in a spot of oil
C) Color on a ruby throated hummingbird
D) All of the above

7. Constructive interference will cause the amplitude of a wave to:

A) Increase
B) Decrease
C) Remain the Same

8. As the phase difference between two superposed waves changes from 90 to 180, the amount of constructive interference:

A) Increase
B) Decreases
C) Remains the Same

 

9. At what angle will two coherent light sources have to turn in order for maximum destructive interference to occur?

A) 45
B) 90
C) 180
D) 270

 

10.At which phase difference will maximum constructive interference occur?

A) l
B) l /2
C) 3l /2
D) l /4

If you have less than 7 points. please repeat this lesson

If you have more than 7, continue to the next lesson