[" 6.A solid copper sphere (density "rho" and specific hearks "],[" radius "r" at an initial temperature "200K" specific heat "c" ) of "],[" a chamber whose walls are at almost "0K" .The time required "],[" for the temperature of the sphere to drop to "100K" is "],[" and point source of heat of power "P" is placed at the centre of "]

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 capacity C and radius r is initially at 200K. It is suspended inside a chamber whose walls are at 0 K. The time required (in mu s) for the temperature of the sphere to drop to 100 K is ( sigma is Stefan's constant and all the quantities are in SI units.)

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 solid copper sphere (density =8900kgm^(-3) and specific heat C=390Jkg^(-1)K^(-1) ) of radius r=10cm is at an initial temperature T_(1)=200K . It is then suspended inside an chamber whose walls are at almost OK . Calculate the time required for the temperature of the sphere to drop to T_(2)=100 K , sigma=5.67xx10^(-8)Wm^(-2)K^(-4) .

A solid copper shere 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 0 K The time required for the temperature of sphere to drop to T_(2) is (rrhoc)/(xesigma)((1)/(T_(2)^(3))-(1)/(T_(1)^(3))) Find the value of x? Take the emmissivity of teh sphere to be equal to e .