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Q.

A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident (and reflected) wave are

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a

40 m/s

b

20 m/s

c

10 m/s

d

5 m/s

answer is B.

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Detailed Solution

At fixed end node is formed and distance between two consecutive nodes λ2=10cm⇒λ=20cm⇒v=nλ=20m/sec

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