A student plotted the following four graphs representing the variation of velocity of sound in a...

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A student plotted the following four graphs representing the variation of velocity of sound in a gas with the pressure \( p \) at constant temperature. Which one is correct?
(a)
(b)
(c) \( \uparrow \uparrow \uparrow \underset{\longrightarrow p}{\longrightarrow} \)
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