During an isothermal expansion, a confined ideal gas does $$-$$ 150 J of work against its surroundings. This implies that

A monatomic gas at pressure P₁ and volume V₁ is compressed adiabatically to $${{1 \over 8}^{th}}$$ of its original volume. What is the final pressure of the gas?

If c_p and c_v denote the specific heats (per unit mass of an ideal gas of molecular weight M, then

If $$\Delta $$U and $$\Delta $$W represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true ?