The pitch of an organ pipe is highest when the pipe is filled with
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(b)
$v=f \lambda$
$=\lambda \text { is constant for an organ pipe }$
$v=\sqrt{\frac{\gamma R T}{M}}$
$v=\frac{1}{\sqrt{M}}$
$v$ is maximum when $M$ is least. Thus, velocity of sound in air is maximum when $M$ is least.
Since $f \propto v$ so $f \propto \frac{1}{\sqrt{M}}$
Hence, frequency is maximum when $M$ is least.
Hence, among options answer is $H _2$.
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