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Standard XII
Physics
Transmission of Wave
Right end of ...
Question

Right end of the string is attached to a light frictionless ring which can freely move on a vertical rod. A wave pulse is sent on the string from left propagating with speed 2.5 cm/s. Initially, the centre of pulse is 5 cm apart from the ring. At, t=2 s, the shape of string can be given as

A
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C
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D
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Solution

The correct option is D
At t=0 s At t=2 s ,
Distance travelled by pulse,
d=v×t=2.5×2=5 cm
As reflection takes place from free end, therefore, pulse is reflected without inversion.
Hence, final shape of the string is


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Transmission of Wave
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