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Go Figure
Estimate the fraction of molecules at 100 °C with speeds less than 300 m/s.
Ump
At 0 °C, fewer than half the
molecules move at speeds
greater than 500 m/s.
At 100 °C, more than
half the molecules
move at speeds greater
than 500 m/s.
the speed
exhibited by the largest
number of molecules
Uav
= the average
(mean) speed of all
the molecules
Urms the speed of a
molecule whose kinetic
energy is equal to the
average (mean) kinetic
energy of all the molecules
0 °C
100 °C
| ||
Fraction of molecules
Fraction of molecules
| ||
11
1
||||
11
0
0
5 X 102 10 X 102
Molecular speed (m/s)
(a)
5 X 102
10 X 102
Molecular speed (m/s)
(b)