Physics

Problem

A heat engine absorbs

600\,\text{J}

of heat from a hot reservoir at

400\,\text{K}

, performs

100\,\text{J}

of work and rejects

500\,\text{J}

of heat to a cold reservoir at

300\,\text{K}

. Which statement is correct? a) The process is irreversible because

\Delta S_{\text{univ}}\approx -0.17\,\text{J\,K}^{-1}

. b) The process is irreversible because

\Delta S_{\text{univ}}\approx 0.17\,\text{J\,K}^{-1}

. c) The process is reversible because

\Delta S_{\text{univ}}=0

. d) The process is irreversible because

\Delta S_{\text{univ}}\approx 3.17\,\text{J\,K}^{-1}