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Two solid spheres are heated to the same...

Two solid spheres are heated to the same temperature and allowed to cool under identical conditions. Assume that all the surfaces have the same emissivity and ratios of their radii, specific heats and densities are respectively `1:alpha,1:beta,1:gamma`.
Compare initial rates of fall of temperature

A

`gamma:alpha^(2)beta`

B

`alpha^(2):beta gamma`

C

`1:alpha^(2)`

D

`alpha beta gamma:1`

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The correct Answer is:
D
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