At constant pressure, which of the following is true for an ideal gas? (where, \( \rho= \) densi...

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At constant pressure, which of the following is true for an ideal gas? (where, \( \rho= \) density of the gas and \( \bar{v}= \) rms speed of the gas)
(a) \( \bar{v} \propto \sqrt{\rho} \)
(b) \( \bar{v} \propto \frac{1}{\rho} \)
(c) \( \bar{v} \propto \rho \)
(d) \( \bar{v} \propto \frac{1}{\sqrt{\rho}} \)
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