One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,

The change in internal energy of the gas during the transition is:

  • Option 1)

    20 J

  • Option 2)

    -12 kJ

  • Option 3)

    20 kj

  • Option 4)

    -20 kJ

 

Answers (1)

As we learnt in 

Total internal energy -

U= U_{K}+U_{P}
 

- wherein

Change in internal energy

Delta U= nfrac{f}{2}RDelta T

(Always)

f is degree of freedom

 

pv =nRT

T = \frac{PV}{nR}

\Delta v =n C_{v}\Delta T = n \frac{R}{r-1}.\left ( T_{f}-T_{i} \right )

or

\Delta v = \frac{1}{r-1}.\left ( nRT_{f} -nRT_{i} \right )

= \frac{P_{f}v_{f}-P_{i}v_{i}}{r-1}

= \frac{2\times 10^{3}\times 6-5\times 10^{3}\times 4}{\frac{7}{5}-1}

= \frac{8\times 10^{3}}{\left ( \frac{2}{5} \right )}J = 20KJ

 


Option 1)

20 J

Incorrect

Option 2)

-12 kJ

Incorrect

Option 3)

20 kj

Correct

Option 4)

-20 kJ

Incorrect

Most Viewed Questions

Preparation Products

Knockout NEET 2024

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 40000/-
Buy Now
Knockout NEET 2025

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 45000/-
Buy Now
Knockout NEET 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout NEET 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series NEET 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 2999/-
Buy Now
Boost your Preparation for NEET 2021 with Personlized Coaching
 
Exams
Articles
Questions