Heat and Thermal ExpansionHard

Question

Radiation from a black body at the thermodynamic temperature T1 is measured by a small detector at distance d1 from it. When the temperature is increased to T2 and the  distance to d2, the power received by the detector is unchanged. What is the ratio d2/d1 ? 

Options

A.
B.
C.
D.

Solution

Intensity in first case
I1 =
Intensity in second case
I2 =
Given I1 = I2 ⇒

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