A one metre long (both ends open) organ pipe is kept in a gas that has double the density of air at $STP$. Assuming the speed of sound in air at $STP$ is $300\; \mathrm{m} / \mathrm{s}$, the frequency difference between the fundamental and second harmonic of this pipe is ___ $\mathrm{Hz}$
JEE MAIN 2020, Diffcult
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