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Question

Temperature at which the rms speed of O2 is equal to that of neon at 300 K is:
  1. 280 K
  2. 680 K
  3. 180 K
  4. 480 K


Solution

The correct option is D 480 K
Let u1 be the rms speed of O2 
u1=3RT1M1
Let u2 be the rms speed of Ne 
u2=3RT2M2
now,
   u1=u2T1M1=T2M2

T132=30020
T1=480 K

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