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If λm for solar radiation is 4573 Ǻ and Wein’s constant b = 2.89 ⨯ 10-3 m – K. calculate the temperature of photo-sphere
What is the quantity of heat required to change 0.02 kg of ice at 0 oC to water at 60 oC ?
[ specific heat capacity of water = 4.2 x 10^3 J kg^-1 o C^-1 ]
[ specific latent heat of fusion of ice = 3.34 x 10^5 J kg^-1 ]
Protons of mass m = 1.67 × 10−24 g and moving with a velocity v = 2×107 m/s strike a target of total mass M = 1g and heat capacity C = 0.334 cal/g/K; the proton beam carries a total current I = 4.8 μA. If 1/3 of the beam energy is converted into heat, calculate the temperature variation of the target in a time interval ∆t = 1 s.
0.05kg of steam at 10 bar, dryness fraction of 0.84 is heated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change in the total entropy, the heat supplied and the average temperature at which heat is added. Show the area which represents the heat supplied on a T-s diagram
The air temperature is 50 degree celsius .water cools from 100 degree celsius to 75 degree celsius in 5minutes.how long will it take for the water to cool to 10 degree celsius
