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Grade 10Thermal Physics

A spherical ball A of surface area 20 is kept at the cantre of a hollow spherical shell B of area . The surface of A & the inner surface of B emit as blackbodies. assume that the thermal conductivity of B IS POOR & that of A is high & there is vacuum between A&B. the heat capacities of A & B are 42J per C & 82J perC. Initially the temp of A is 100C & that of B is 20C. find the rate of change of temp of A & that of B @ this instant.

Navjyot Kalra

12 Years agoGrade 10

1 Answer

Abhishek Kumar

11 Years ago

In given conditions, heat transfer is only through radiation.
Heat loss by spherical shell = Heat gained by inner ball = kA $\Delta T/\Delta x$
$\Delta x$ = distance between the two surface

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