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When the centre of earth is at a distance of 1 5 x 1011 m...

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When the centre of earth is at a distance of 1 5 x 1011 m from the centre of sun the intensity of solar radiation reaching at the earth s surface is 1 26 kW m2 There is a spherical cloud of cosmic dust containing iron particles The melting point for iron particles in the cloud is 2000 K Find the distance of iron particles from the centre of sun at which the iron particle starts melting Assume sun and cloud as a black body o 5 6 x 10 8 W m K4 A 2 81 x 106 m C 2 81 x 10 m B 2 81 x 10 m D 1 40 10 0 m

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