કયા તાપમાને હાઈડ્રોજન વાયુની \(rms\) ઝડપ પૃથ્વીની નિષ્ક્રમણ ઝડપ જેટલી થાય?[બોલ્ટ્ઝમેન અચળાંક \(k_B = 1.38\times10^{-23}\, J / K\) એવોગ્રેડો નંબર \(N_A = 6.02\times10^{26}\, / kg\) પૃથ્વીની ત્રિજ્યા  \(: 6.4\times10^6\, m\) પૃથ્વી પર ગુરુત્વપ્રવેગ \(= 10\, ms^{-2}\)]

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.