A sphere of ice at `0^(@)C` having initial radius `R` is placed in an environment having ambient temperature `gt 0^(@)C`. The ice melts uniformly, such that shape remains spherical. After a time 't' the radius of the sphere has reduced to r. which graph best depicts r(t)

black colored solid sphere of radius "R" and mass "M" is inside a cavity with vacuum inside.The walls of the cavity are maintained at temperature T_(0) .The initial temperature of the sphere is 3T_(0) .If the specific heat of the material of the sphere varies as alpha T^(3) per unit mass with the temperature of the sphere,where alpha is a constant,then the time taken for the sphere to cool down to temperature 2T_(0) will be ( sigma Stefan Boltzmann constant)

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 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 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.