A hollow and a solid sphere of same material and having ide…

Physics Transmission of Heat General MCQ (Single Correct)

A hollow and a solid sphere of same material and having identical outer surface are heated under identical condition to the same temperature at the same time (both have same e, a):

in the beginning both will emit equal amount of radiation per unit time

in the beginning both will absorb equal amount of radiation per unit time

both spheres will have same rate of fall of temperature (dT/dt)

both spheres will have equal temperatures at any moment

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a, b)

P emitte = σ eAT 4

since T 1 = T 2

P absorb = σ eAT S 4

So P 1 = P 2 at t = 0

cooling rate =

since M H < M S , so cooling rate will be different since cooling rate is not same so both will not have same temp at any instant t (except t = 0)

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