Question

In a system, \(x\,\mathrm{J}\) of heat is absorbed and \(y\,\mathrm{J}\) of work is done by the system. What is \(\Delta U\) (in kJ)?

• A. \((x-y)\times10^{-3}\)
• B. \((x+y)\)
• C. \((x-y)\times10^{3}\)
• D. \(\dfrac{x}{y}\times10^{-3}\)

Hint:

First law of thermodynamics: \[ \boxed{ \Delta U=q-w } \] where \(q\) is positive when heat is absorbed and \(w\) is positive when work is done by the system.

Answer 1

The Correct Option is A