Consider the sun to be a perfect sphere of radius `6.8 xx 10^(8)m`. Calculate the energy radiated by sun in one minute. Surface temperature of the sun `= 6200 K`. Stefan's constant `= 5.67 xx 10^(-8) J m^(-2) s^(-1) K^(-4)`.

Calculate the energy radiated in one minute by a blackbody of surface area 200 cm^2 at 127 ""^(@)C ( sigma= 5.7 xx 10^(-8) J m^(-2) s^(-1) K^(-4))

Calculate the energy radiation by the sun in 2 mins if it is considered to be perfect sphere of radius 6.8 xx 10^8 m and its surface temperature is approximately 6200 K. Take sigma = 5.67 xx 10^(-8) Jm^(-2) s^(-1) K^(-4)

Calculate the temperature at which a perfect black body radiates at the rate of 1 W cm^(-2) , value of Stefan's constant, sigma = 5.67 xx 10^(-8) W m^(-2)K^(-4)

The surface temperature of the sun is 6000K . If we consider it as a perfect black body, calculate the energy radiated away by the sun per second. Take radius of the sun =6.92xx10^(5)km and sigma=5.67xx10^(-8)Jm^(-2)s^(-1)K^(-4)

Calculate the temperature at which a perfect black body radiates at the rate of 1 W cm^(-2) , value of Stefan's constant, sigma = 5.67 xx 10^(-5) W m^(-2) K^(-8)

The solar energy received by the Earth persquare metre per minute is 8.315 xx 10^(4)Jm^(-2)min^(-1) . If the radius of the Sun is 7.5 xx 10^(5) km and the distance of the Earth from the Sun is 1.5 xx10^(8) km, calculate the surface temperature of Sun. Assume the Sun as a perfect black body. Given that Stefen constanta sigma = 5.7 xx 10^(-8)Wm^(-2)K^(-4).

A hot body at 800^@C is radiating 500 J of energy per minute. Calculate the surface area of the body if emissivity is 0.23 and Stefan's constant is 5.67 xx 10^(-8) Wm^(-2) K^(.-4) .

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 W . The temperature of the hot steel plate is (Stefan's constant sigma = 5.67 xx10^(-8) " watt "m^(-2) K^(-4) , emissivity of the plate = 1)