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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  1999
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Q)

A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temp. If its temp. falls to 400 K then its colling rate will be -


( A ) None
( B ) $ \frac{16}{3}R$
( C ) $ \frac{3}{16}R$
( D ) $ \frac{9}{27}R$

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