An ideal heat engine working between temperature \( T_{1} \) and \(...

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An ideal heat engine working between temperature \( T_{1} \) and \( T_{2} \) has an efficiency \( \eta \), the new efficiency if both the source
\( \mathrm{P} \) and sink temperature are doubled, will be
[DPMT 2000; KCET 2010]
W
(a) \( \frac{\eta}{2} \)
(b) \( \eta \)
(c) \( 2 \eta \)
(d) \( 3 \eta \)
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