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Q.

The root mean square speed.of the rnolecules of a diatomic gas is v. When the temperature is doubled, the molecules dissociate into two atoms. The new root mean square speed of the atom is

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a

2v

b

v

c

2v

d

4v

answer is C.

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Detailed Solution

vrms = 3RTM      According to problem T will become T2 and M will become M2 so the value of vrms will increased by 4 = 2 times  i.e., new root mean square velocity will be 2v.
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