A Carnot engine initially works between (hot reservoir) and (cold reservoir)

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering 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\%

(b)

10.0\%

(c)

9.7\%

(d)

6.7\%