Cooling rate of a sphere of $600\,K$ at external environment $(200\,K)$ is $R$ . When the temperature of sphere is reduced to $400\,K$ then cooling rate of the sphere becomes
Cooling rate of a sphere of $600\,K$ at external environment $(200\,K)$ is $R$ . When the temperature of sphere is reduced to $400\,K$ then cooling rate of the sphere becomes
- A
$\frac{3}{{16}}\,R$
- B
$\frac{16}{{3}}\,R$
- C
$\frac{9}{{27}}\,R$
- D
None
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