NTA Abhyas JEE Main2020PhysicsThermodynamicsPractice
An ideal diatomic gas occupies a volume V 1 at a pressure P 1 . The gas undergoes a process in which the pressure is proportional to the volume. If at the end of the process the R.M.S. speed of the gas molecules has doubled its initial value, then the heat supplied to the gas, in the given process, is
Options
- A7 P 1 V 1
- B8 P 1 V 1
- C9 P 1 V 1
- D10 P 1 V 1
Correct answer
C. 9 P 1 V 1
Step-by-step solution
As P ∝ V , P V - 1 = constant comparing the above equation with P V x = constant , we get x = - 1 Also, C = C V - R x - 1 = 5 2 R - R - 1 - 1 = 3 R But as RMS speed is doubled therefore temperature becomes four times. Hence, Q = n C Δ T = n × 3 R × 3 T i = 9 n R T i = 9 P 1 V 1