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Old 10-24-2008, 19:51
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5. If the pressure of a fixed mass of gas is doubled and its absolute temperature is halved, the r.m.s. speed of its molecules is
A halved
B decreased by a factor of square root 2
C unchanged
D increased by a factor of square root 2
E doubled

I found that when pressure is doubled, the r.m.s. speed increased by a factor of square root 2 and when temperature is halved, the root mean square speed is dropped by a factor of square root 2. Shouldn't the answer be C? Why the answer given is B?

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Old 11-17-2008, 03:00
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hi bcz
pressure=1/3xdensityx<c,square>
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