Verification of laws of reflection of Sound. Determination of the velocity of a pulse propagated...

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Verification of laws of reflection of Sound.
Determination of the velocity of a pulse propagated through a stretched string/slinky.
A string is stretched as shown in Fig. and a pulse is created along it. The stopwatch is started from its position \( A \), when the pulse is in position \( X \) and is stopped in its position \( B \), when the pulse has travelled back to its position \( X \).
Find the velocity of propagation of the pulse along the string.
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