A string is tied at two rigid supports. A pulse is generated on the string as shown in figure. Minimum time after which string will regain its shape as shown in figure (Neglect the time during reflection)

Question

A string is tied at two rigid supports. A pulse is generated on the string as shown in figure. Minimum time after which string will regain its shape as shown in figure (Neglect the time during reflection), 2 s, 4 s, 6 s, none of these

MARKS App · Accepted Answer

At the shape of pulse gets inverted. The pulse will become erect after reflection at A . So the wave has to travel one complete round i.e. 12 m to regain its shape as the original. Therefore minimum time is, t m i n = d v t m i n = 12 2 = 6 s

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