Q.

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

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a

2 u

b

u

c

2u

d

4u

answer is C.

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Detailed Solution

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u=3RTM

According to problem T will become 2T and M will become M/2 so the value of u will increase by 4=2times i.e, new root mean square velocity will be 2u.

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