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Question

At what temperature will oxygen molecules have the same root mean square speed as hydrogen Molecules at 200 K?


A

5270C

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B

13270C

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C

21270C

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D

29270C

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Solution

The correct option is D

29270C


For oxygen:

vrms = 3kT0m0

For hydrogen:

vrms = 3kThmh

The value of vrms will be the same if

T0m0 = Thmh

Or T0 = m0mh × Th = 16 × 200

= 3200 K = 2927C

Hence the correct choice is (d)


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