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Byju's Answer
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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A string of linear mass density 0.5 g cm−1 and a total length 30 cm is tied to a fixed wall at one end and to a frictionless ring at the other end (figure 15-E4). The nng can move on a vertical rod. A wave pulse is produced, on the string which moves towards the ring at a speed of 20 cm s−1. The pulse is symmetric about its maximum, which is located at a distance of 20 cm from the end joined to the ring. (a) Assuming that the wave is reflected from the ends without loss of energy, find the time taken by the string to regain its shape. (b) The shape of the string changes periodically with time.Find this time period. (c) What is the tension in the string ?

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