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Q.

A body Vibrating with a certain frequency sends waves 15 cm long through a medium A and 20 cm long through a medium B. The velocity of waves in A is 120 cm/sec. The velocity in B is

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a

640 m/s

b

320 m/s

c

480 m/s

d

160 m/s

answer is A.

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Detailed Solution

$v \propto d$
$\begin{array}{l} \frac{v_{1}}{v_{2}} = \frac{d_{1}}{d_{2}} \\ \frac{15}{20} = \frac{120}{v_{B}} \\ v_{B} = \frac{120 \times 20}{15} \\ v_{B} = 160 m / s \end{array}$

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