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the incorrect readation is​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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11th

Physics

Kinetic Theory

Law of Equipartition of Energy

Select the incorrect relati...

CHEMISTRY

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Asked on December 20, 2019 by

Vignesh Bindal

Select the incorrect relation. (Where symbols have their usual meanings)

MEDIUM

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ANSWER

Solution:- (C) ΔU=

1−γ

P

f

V

f

−P

i

V

i

As we know that,

ΔU=nC

v

ΔT

Whereas,

n= No. of moles

C

v

= Heat capacity at constant volume =

γ−1

R

ΔT= Change in temperature =T

f

−T

i

∴ΔU=n

γ−1

R

(T

f

−T

i

)

⇒ΔU=

γ−1

nRT

f

−nRT

i

.....(1)

Now from ideal gas equation,

PV=nRT

For the same no. of moles of a gas,

nRT

f

=P

f

V

f

nRT

i

=P

i

V

i

Substituting these values in eq

n

(1), we have

ΔU=

γ−1

P

f

V

f

−P

i

V

i

Hence the given option (C)ΔU=

1−γ

P

f

V

f

−P

i

V

i

is incorrect.