A source of frequency $f$ is emitting sound waves. If temperature of the medium increases, then
KVPY 2009, Medium
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(a)
Velocity of sound in an isentropic gascous medium is given by
$v=\sqrt{\frac{\gamma R T}{M}} \Rightarrow v \propto \sqrt{T}$
Also, $\quad v=f \lambda \Rightarrow \lambda \propto \sqrt{ T }$
Because frequency is a characteristics of source and it remains constant with change in temperature of medium.
So, correct option is $(a)$.
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