First slide

Travelling wave

Question

Find the frequency of minimum distance between compression & rarefaction of a wire. If the length of the wire is 1m & velocity of sound in air is 360 m/s

Moderate

A

90 sec^–1
B

180s^–1
C

120 sec^–1
D

360 sec^–1

Solution

The minimum distance between compression and rarefaction of the wire $l = \frac{λ}{2} ∴$ Wave length $λ = 2 l$
Now by $v = nλ \Rightarrow n = \frac{360}{2 \times 1} = 180 \sec^{- 1} .$

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