P20 021

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21. First we rewrite Eq. 20-22 using Eq. 20-4 and Eq. 20-7:

v

rms

=



3RT

M

=



3 (kN

A

) T

(m N

A

)

=



3kT

M

.

The mass of the electron is given in the problem, and k = 1.38

× 10

23

J/K is given in the textbook.

With T = 2.00

× 10

6

K, the above expression gives v

rms

= 9.53

× 10

6

m/s. The pressure value given in

the problem is not used in the solution.


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