First slide

Speed of wave

Question

A wave 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 1O cm from the fixed end of the string. The speeds of incident (and reflected) wave are

Easy

A

40 m/s
B

20 m/s
C

10 m/s
D

5 m/s

Solution

Distance between two nodes.i.e. $\frac{λ}{2} = 10$
or $λ$ =20
Now $V = n λ = 100 \times 20 cm / \sec = 20 m / s$

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