A Block of Ice

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Can radiate as well as absorb heat

Cannot radiate heat

Is an example for a black body

Is an example for a white body

answer is A.

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Detailed 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.

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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