Q.

Ratio of RMS velocity of Helium at 1200 K  to RMS velocity of Hydrogen at 300 K will be

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a

2:1

b

1:1

c

2.82:1

d

1.414 : 1

answer is D.

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Detailed Solution

C1C2=T1M2T2M1; CHeCH2=1200×2300×4=1.414 ;
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Ratio of RMS velocity of Helium at 1200 K  to RMS velocity of Hydrogen at 300 K will be