Physics Review Question Unit: Waves Year: 1995 Question#: 42 Question: The diagrtam below represents a rope along which two pulses of equal amplitude, A, approach point P. When the two pulses meet at P, the vertical displacement of the rope at point P will be (1 ) A (2 ) 2A (3 ) 0 (4 ) A/2 What is this question really asking? Explanation by: Matt G. [ Return to question menu ] Answer 1 A INCORRECT It is not two A because when the waves hit they will add their two amplitudes up. return to top Answer 2 2A CORRECT These two waves have constructive interference. This is when both waves are moving in opposite directions, with the same orientation. return to top Answer 3 0 INCORRECT This would be destructive interference. That is when two waves travel towards each other with the opposite orienation. return to top Answer 4 A/2 INCORRECT I have no idea where this answer came from, but it is wrong. Amplitudes during interference only add and subtract, they can't multiply or divide. return to top What's this question really asking? What is constructive interference?. return to top |
[Home] [Lessons] [Review] [Search] [Links]
This web site is designed and maintained by Science Joy Wagon and may
not be reproduced or redistributed without written permission from Science Joy Wagon. |