Question

(b) Find the mean free path of helium molecules at a
temperature of OC and a pressure of 760 mm Hg.
Coefficient of viscosity is 1.3 x 10- Nm-4 s. Density
of helium is 1.1786 kg m-​

Answer 1

answer PHYSICS

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Calculate the means free path of nitrogen molecule at 27

o

C when pressure is 1.0 atm. Given, diameter of nitrogen molecule =1.5

A

o

, k

B

=1.38×10

−23

J K

−1

. If the average speed of nitrogen molecule is

C=27+273=300K.

P=1atm =1.01×10

5

N m

−2

, d=1.5

A

o

=1.5×10

−10

m,

k

B

=1.38×10

−23

J K

−1

,λ=?

From λ=

2

πd

2

p

k

B

T

=

1.414×3.14(1.5×10

−10

)

2

×1.01×10

5

1.38×10

−23

×300

=4.1×10

−7

m

Time interval between two successive collisions

t=

speed

distance

=

v

λ

=

675

4.1×10

−7

=0.6×10

−9

s

Answer 2

Explanation:

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