A solid sphere of radius 'R' density `rho` and specific heat 'S' initially at temperature `T_(0)` Kelvin is suspended in a surrounding at temperature 0K. Then the time required to decrease the temperature of the sphere from `T_(0)` to `(T_(0))/(2)` kelvin is (Assume sphere behaves like a black body)

A solid sphere of radius 'R' density 'rho' , and specific heat 'S' initially at temperature T_0 Kelvin is suspended in a surrounding at temperature 0 K. Then the time required to decrease the temperature of the sphere from T_0 to T_0/2 Kelvin is alpha xx (rhoSR)/(sigmaT_0^3) . Find alpha . (Assume sphere behaves like a black body )

A solid copper sphere (density rho and specific heat c) of radius r at an initial temperature 200K is suspended inside a chamber whose walls are at almost 0K. The time required for the temperature of the sphere to drop to 100K is …….

A solid copper sphere (density rho and specific heat c) of radius r at an initial temperature 200K is suspended inside a chamber whose walls are at almost 0K. The time required for the temperature of the sphere to drop to 100K is …….

A solid copper sphere of density rho , specific heat c and radius r is at temperature T_1 . It is suspended inside a chamber whose walls are at temperature 0K . What is the time required for the temperature of sphere to drop to T_2 ? Take the emmissivity of the sphere to be equal to e.

A solid copper sphere of density rho , specific heat c and radius r is at temperature T_1 . It is suspended inside a chamber whose walls are at temperature 0K . What is the time required for the temperature of sphere to drop to T_2 ? Take the emmissivity of the sphere to be equal to e.

A sphere of radius r, density, rho and specific heat s is heated to temperature theta and then cooled in an enclosure at temperature theta_(0) . How , the rate of fall of temperature is related with r, rho and s?