- #1

LCSphysicist

- 634

- 153

- Homework Statement:
- Print below

- Relevant Equations:
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First i computed the rate of energy wrt time of the second plate:

$$dq_{2}/dt = A \sigma ((373)^4/2 + (273)^4/2 - T_{2}^4)$$

Equaliting it to zero we get the answer. But i am not sure why do we need to equality it to zero.

The q arrow on the figure suggest me that it is conservation of energy (radiation flux), but i don't get why.

The black body has transmission coefficient ##\tau = 0##, so i don't understand why the flux of radiation need to be equal. The body could pretty well absorb the energy coming from 1 and emite an energy to 3 totally different, couldn't?