
|
$(A)$ 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 |
$(A)$ If the wind blows from the observer to the source, $f_2 > f_1$.
$(B)$ If the wind blows from the source to the observer, $f_2 > f_1$.
$(C)$ If the wind blows from the observer to the source, $f _2 < f _1$.
$(D)$ If the wind blows from the source to the observer, $f _2 < f _1$.