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A wave of frequency 100 Hz s sent along ...

A wave of frequency 100 Hz s sent along a string towards a fixed unit. 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 speeds of incident (or reflected) waves are :

A

40 m/s

B

20 m/s

C

10 m/s

D

5 m/s

Text Solution

Verified by Experts

The correct Answer is:
B
The fixed end is also a node distance between two nodes = `(lambda)/(2) = 10` cm
or `lambda= 20` = 0.2 cm
Speed `v = f lambda = 100 xx 0.2 = 20` m/s
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