Unit 2 Worksheet 3 Key



Key for Waves Unit II, Worksheet 3

Questions 1-4 show pulses A and B at time = 0 as they head toward each other. Each pulse travels at a constant speed of 2 squares per second on a string which is 16 squares long. For questions 1-4, at t = 1 s, 2 s, 3 s, and 4 s, show the position of pulse A in red and pulse B in blue. Using the principle of superposition, show the resultant displacement of the string in green.

1. 2. 3. 4.

Questions 5 - 8 show pulses A and B at time = 0 as they head toward each other at the same constant speed of 1 square per second. The string which is 16 squares long. For questions 5 - 8, at t = 3 s, 4 s, 5 s, and 6 s, show the position of pulse A in red and pulse B in blue. Using the principle of superposition, show the resultant displacement of the string in green.

5. 6. 7. 8.

Questions 9 – 16 show pulses A and B as they head toward each other. On the graph below each situation, show the position of pulse A (in red) and pulse B (in blue) at the instant the centers of the pulses overlap. Using the principal of superposition, show the resultant displacement of the string in green.

9. 10. 11. 12.

13. 14. 15. 16.

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t = 4s

t = 3s

t = 2s

t = 1s

t = 0

A

t = 0

B

t = 6s

A

A

A

A

t = 5 s

B

B

B

t = 4s

t = 3s

B

B

A

A

A

B

B

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