a collection of molecules has the following distribution of speeds:
speed (m/s): 1 2 3 4 5 6
number: 1 3 5 8 4 2
find:(A)the average speed;(B)the rms speed;(C)the most probable speed.
kinetic theory??
2007-03-10 4:45 am
回答 (1)
2007-03-10 7:29 am
✔ 最佳答案
Altogether there are 1+3+5+8+4+2 = 23 molecules(a) average speed = [1+3x2+5x3+8x4+4x5+2x6]/23 m/s
(b) rms is the roor-mean-square speed,
thus meam square speed = [1x1^2+3x2^2+5x3^2+8x4^2+4x5^2+2x6^2]/23 (m/s)^2
rms = sqrt{[1x1^2+3x2^2+5x3^2+8x4^2+4x5^2+2x6^2]/23} m/s
(c) the most probable speed is the speed that occurred by most no. of molecules, that is 4 m/s
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