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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > One end of a rod of length 20cm is inserted in a furnace at 800K The sides of the rod are coverd with an insulating meterial and the other end emits radiation like a black boy The temperature of this end is 750K in the steady state The temperature of the surrounding air is 300K Assuming radiation to be the only important mode of energy transfer between the surrounding and the open end of the rod, find the thermal conductivity of the rod Stefan’s

One end of a rod of length 20cm is inserted in a furnace at 800K The sides of the rod are coverd with an insulating meterial and the other end emits radiation like a black boy The temperature of this end is 750K in the steady state The temperature of the surrounding air is 300K Assuming radiation to be the only important mode of energy transfer between the surrounding and the open end of the rod, find the thermal conductivity of the rod Stefan’s

The intensity of solar radiation just outside the earth's atmosphere is measured to be 1.4kW/m^2. If the radius of the sun 7×10^8m then find i. the intensity of salr radiation at the surface of the sun. ii. the temperature at the surface of the sun assuming it to be a black body while the earth-sun distance is 150×10^6km