The wave pulses shown above travel along a string toward one another. A) B) C) D

Question

The wave pulses shown above travel along a string toward one another.

A)

B)

C)

D)

E)

F)

G)

H)

  For each diagram above, select from below the picture of the string at the instant of time when the two pulses overlap completely.  E.g., if the answer to 1 is A and the answer to 2 is G, enter AG.  

The wave pulses shown above travel along a string toward one another. For each diagram above, select from below the picture of the string at the instant of time when the two pulses overlap completely. E.g., if the answer to 1 is A and the answer to 2 is G, enter AG.

Explanation / Answer

first is a case of constructive interference:

Amplitudes shall add:

So, maximum amplitude shall be 0.5 + 0.5 = 1.0 m

Also, a square wave shall just uplift the triangular wave by 0.5 m

Thus 1-A

For 2nd there is a destructive interference at the centre.

Thus, amplitude = 0.5 - 0.5 = 0 m at the center and end points shall have max amplitude of 0.5m

Thus, 2 - D

Ans: AD

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