First slide

Change in internal energy

Question

One mole of diatomic ideal gas undergoes a cyclic process ABCA as shown in figure. The process BC is adiabatic. The temperatures at A,B and C are 400K, 800K and 600K respectively. Choose the correct statement :

Easy

A

The change in internal energy in the process BC is – 500R
B

The change in internal energy in whole cyclic process is 250 R
C

The change in internal energy in the process CA is 700R
D

The change in internal energy in the process AB is – 350R

Solution

C_v = fR/2
For diatomic gas, f = 5
$\therefore {C_v} = \frac{{5R}}{2}$
$\therefore \Delta {U_{BC}} = {U_C} - {U_B} = 1\frac{{5R}}{2}\left( {600 - 800} \right)$
= -500R

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App