Physics

Problem

A Carnot engine initially works between

600\,\text{K}

(hot reservoir) and

300\,\text{K}

(cold reservoir). If the hot reservoir temperature is raised by

20\,\text{K}

while the cold reservoir temperature is lowered by

20\,\text{K}

, the percentage increase in its efficiency is closest to a)

4.8\%

10.0\%

9.7\%

6.7\%