CAPE Physics Unit 1 · 2011 · Paper 1 · Question Q40
A gas contains N molecules. The speeds of the molecules are C_1, C_2, \dots, C_N. Which of the following equations can be used to determine the r.m.s speed of the molecules?
- (A)
\sqrt{\frac{C_1 + C_2 + \dots C_N}{N}} - (B)
\sqrt{\frac{C_1^2 + C_2^2 + \dots C_N^2}{N}} - (C)
\sqrt{\frac{(C_1 + C_2 + \dots C_N)^2}{N}} - (D)
\sqrt{\frac{(C_1^2 + C_2^2 + \dots C_N^2)^2}{N}}
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