CBSE Class 12-science Answered
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Asked by sudheerkapoor67 | 14 Feb, 2018, 03:49: AM
Expert Answer
Speed of wave in a stretched string, 
F is tension in the string, F = mg, where m is mass of string and g is acceleration due to gravity.
we have to consider the string is getting stretched due to its own weight.
μ is mass per unit length which is m/20
hence 
time taken for the pulse = distance / velocity = 20 / (10√2) = √2 s
Answered by Thiyagarajan K | 14 Feb, 2018, 12:59: PM
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