Solved papers for JEE Main & Advanced JEE Main Solved Paper-2015

done JEE Main Solved Paper-2015 Total Questions - 1

• question_answer1) Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume\[u=\frac{U}{V}\propto {{T}^{4}}\]and pressure\[p=\frac{1}{3}\left( \frac{U}{V} \right).\]If the shell now undergoes an adiabatic expansion the relation between T and R is : [JEE Main Solved Paper-2015 ]
  A)
  \[T\propto \frac{1}{R}\]               
  done clear
  B)
  \[T\propto \frac{1}{{{R}^{3}}}\]
  done clear
  C)
  \[T\propto {{e}^{-R}}\]                 
  done clear
  D)
  \[T\propto {{e}^{-3R}}\]
  done clear
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