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A solid copper cube of edges \( 1 \mathrm{~cm} \) is suspended in an evacuated enclosure. Its temperature is found to fall from
\( \mathrm{P} \) \( 100^{\circ} \mathrm{C} \) to \( 99^{\circ} \mathrm{C} \) in \( 100 \mathrm{~s} \). Another solid copper cube of

W edges \( 2 \mathrm{~cm} \), with similar surface nature, is suspended in a similar manner. The time required for this cube to cool from \( 100^{\circ} \mathrm{C} \) to \( 99^{\circ} \mathrm{C} \) will be approximately
[MP PMT 1997]
(a) \( 25 s \)
(b) \( 50 \mathrm{~s} \)
(c) \( 200 \mathrm{~s} \)
(d) \( 400 s \)
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