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Manipal Entrance Test 2016 Physics Paper
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© examsnet.com
Question : 5
Total: 50
A mixture of two gases is contained in a vessel. The gas 1 is monoatomic and gas 2 is diatomic and the ratio of their molecular masses
M
1
M
2
=
1
4
.
What is the ratio of root mean square speeds of the molecules of two gases?
2
4
8
16
Validate
Solution:
From kinetic theory of gases
p
=
1
3
M
V
.
e
2
Since, p and V are constant (same)
∴
M
1
e
1
2
=
M
2
e
2
2
⇒
e
1
e
2
=
√
M
2
M
1
=
√
4
1
=
2
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