In a system of N gas molecules, the individual speeds are v1, v2, ..., vN . The rms speed of these molecules is:
A. 1 N ?v1 + v2 + ... + vN
B. 1 N v2 1 + v2 2 + ... + v2 N
C. (v2 1 + v2 2 + ... + v2 N )/N
D. [(v1 + v2 + ... + vN )/N] 2
E. 0(v1 + v2 + ... + vN )2/N
Answer: C. (v2 1 + v2 2 + ... + v2 N )/N
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(A) 15 cm
(B) 20 cm
(C) 25 cm
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