First slide

Standing waves

Question

A wave pulse on a string has the dimension shown in figure. The wave speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is :

Moderate

A
B
C
D

Solution

The formation of the reflected pulse from a free support is similar to the overlap of two pulses of same nature travelling in opposite directions as shown below :
Therefore, net displacement of all point will become twice as shown below :

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