. When heat energy of 1500 Joules , is supplied to a gas at constant pressure `2.1xx10^(5)N//m^(2),` there was an increase in its volume equal to `2.5xx10^(-3)m^(3)`.The increase in internal energy of the gas in joules is

Options

A. 450
B. 525
C. 975
D. 2025

Answer

C

Explanation

`Delta Q=Delta U+P Delta V implies Delta U=Delta Q-P DeltaV`
`=1500-(2.1xx10%5)(2.5xx10^(-3))=975 J`