A vessel contains only three gas molecules. Which of the following relation is correct for RMS speed (u), average speed (c) and most probable speed (α) for the molecules?

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The most probable speed α is defined only for a Maxwell distribution; three molecules form no distribution, so α cannot be predicted. For a few speeds, RMS ≥ mean, with c < u whenever the speeds are not all identical. The best statement is (c). Confirms Ans (c).

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