A Block of Ice

Absolute temperature of ice block T = (0+273) = 273K. Rate of radiation from the surface of a block of iceQr=eσAT4where 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 absorptionQa=aσAT04where '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.