First slide

Radiation

Question

A Block of Ice

Easy

A

Can radiate as well as absorb heat
B

Cannot radiate heat
C

Is an example for a black body
D

Is an example for a white body

Solution

Absolute temperature of ice block T = (0+273) = 273K. Rate of radiation from the surface of a block of ice $Q_{r} = e σ A T^{4}$
where e= emissivity of the surface of ice block.
When radiation from surrounding (at temperature T₀) is incident on the surface of ice block, rate of absorption
Q_a= $a σ A T_{0}^{4}$
where 'a' = absorptivity of the surface so option - (1) is correct.
according to Prevost theory of heat exchange any substance above 'O' K emits as well as absorb heat with the surrounding.

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