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$(A)$ Temperature of gas is made $4$ times and pressure $2$ times |
$(P)$ Speed becomes $2\sqrt 2$ times |
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$(B)$ Only pressure is made $4$ times without change in temperature |
$(Q)$ Speed become $2$ times |
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$(C)$ Only temperature is changed to $4$ times |
$(R)$ Speed remains unchanged |
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$(D)$ Molecular mass of the gas is made $4$ times |
$(S)$ Speed becomes half |
$I.$ The speed of the wave is $4n \times ab$
$II.$ The medium at $a$ will be in the same phase as $d$ after $\frac{4}{{3n}}s$
$III.$ The phase difference between $b$ and $e$ is $\frac{{3\pi }}{2}$
Which of these statements are correct