# Answer to Question #39517 in Molecular Physics | Thermodynamics for rupesh singh

Question #39517

The surface of a ball of radius A is kept at a temperature zero. If the initial temperature in the

ball is f (r), write down the boundary conditions and show that the temperature in the ball at

time t, u (r, t), is the solution to the equation:

c^2[(d^2u/dr^2)+2/r(du/dr)]=du/dt

note: here every du/dr or du/dt stands for partial differentiation wrt respected term

ball is f (r), write down the boundary conditions and show that the temperature in the ball at

time t, u (r, t), is the solution to the equation:

c^2[(d^2u/dr^2)+2/r(du/dr)]=du/dt

note: here every du/dr or du/dt stands for partial differentiation wrt respected term

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