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Kty
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First you get to know the surface area of a sphere, that is A=4*pi*r^2 All the info listed down: Emissivity,e=1 (blackbody has a good emissivity) radius,r=0.30m Temperature, T2=77K T1=4.2K Latent heat of vaporization,L=2.1*10^4 J/kg Time,t=1hour=3600sec
