First slide

Stationary waves

Question

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

Easy

A

40 m/s
B

20 m/s
C

10 m/s
D

5 m/s

Solution

At fixed end node is formed and distance between two consecutive nodes $\frac{λ}{2} = 10 cm \Rightarrow λ = 20 cm$
$\Rightarrow v = nλ = 20 m / \sec$

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