Question

The change in internal energy, when a gas is cooled from 927° to 27° is?

(a) 100%

(b) 300%

(c) 200%

(d) 75%

I had been asked this question in my homework.

This is a very interesting question from Specific Heat and Thermodynamics topic in chapter Kinetic Theory of Gases of Engineering Physics I

Answer 1

Correct option is (d) 75%

To elaborate: U=nCv T

∆U/U×100=∆T/T×100

∆U/U×100=(1200-300)/1200×100=9/12×100=75%.