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Two identical metal balls at temperature $200^{0} C and 400^{0} C kept in air at 27^{0} C . The ratio of net heat loss by these bodies$

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Correct option is D

If temperature of surrounding is considered, then net loss of energy of a body by radiationQ = A∈σ(T4-T04)t ⇒ Q directly proportional to (T4-T04)⇒ Q1Q2 = T14-T04T24-T04 = (273+200)4-(273+27)4(273+400)4-(273+27)4 = (473)4-(300)4(673)4-(300)4

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Two identical metal balls at temperature 2000C and 4000C kept in air at 270C. The ratio of net heat loss by these bodies

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Two identical metal balls at temperature $200^{0} C and 400^{0} C kept in air at 27^{0} C . The ratio of net heat loss by these bodies$