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Q.

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere? Given: Mass of oxygen molecule (m) : 2.76x 10-26 kg ; Boltzmann's constant kB = 1.38x 10-23     JK-1 )

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a

1.254×104 K

b

2.508 × 104 K

c

5.016×104 K

d

8.360×104K

answer is D.

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Detailed Solution

Ves= Vrms11.2 × 103 = 3kBTm⇒T = (11.2×103)2m3kBPutting value of m and kBT = 8.360×104 K
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