For an adiabatic compression W=100J, what will be ∆U?

Explanation

The correct answer is C because in an adiabatic process, there is no heat exchange (Q = 0) between the gas and its surroundings. The work done on the gas during the adiabatic compression is given as W = 100 J. According to the First Law of Thermodynamics, ∆U = Q - W, where ∆U is the change in internal energy, Q is the heat exchange, and W is the work done on the system. Since the process is adiabatic (Q = 0), the change in internal energy (∆U) is equal to the work done (W) on the system, which is 100 J. Therefore, the correct answer is C, +100 J.