AP EAMCET202021 Sep 2020Morning ShiftPhysicsThermodynamicsActual
A gas is compressed from a volume of (2 ~m ^3 ) to a volume of (1 ~m ^3 ) at a constant pressure of (100 Nm ⁻² ). Then it is heated at constant volume by supplying (150 ~J ) of energy. As a result, the internal energy of the gas
Options
- Aincrease by (250 ~J )
- Bdecrease by (250 ~J )
- Cdecrease by (50 ~J )
- Dincrease by (50 ~J )
Correct answer
A. increase by (250 ~J )
Step-by-step solution
Since, gas is compressed from (2 ~m ^3 ) to ( lm ^3 ). Hence, work done on the gas is negative. (W=-p V=-100(2-1)=-100 ~J ) Since, heat supplied, (Q=150 ~J ) Hence, according to first law of thermodynamics, ( aligned Q & =W+ U 150 & =-100+ U U & =150+100=250 ~J aligned )