A solid at temperature `T_(1)` is kept in an evacuated chamber at temperature `T_(2)gtT_(1)` . The rate of increase of temperature of the body is propertional to

A solid at temperature T_(1) is kept in an evacuated chamber at temperature T_(2)gtT_(1) . The rate of increase of temperature of the body is proportional to

A solid maintained at t_(1)^(0) is kept in an evacuated chamber at temperature t_(2) ""^(0)C (t_(2) gt gt t_(1)) .Rate of heat absorbed by the body

A copper block of mass 'm' at temperature 'T_(1)' is kept in the open atmosphere at temperature 'T_(2)' where T_(2) gt T_(1) . The variation of entropy of the copper block with time is best illustrated by

A copper block of mass 'm' at temperature 'T_(1)' is kept in the open atmosphere at temperature 'T_(2)' where T_(2) gt T_(1) . The variation of entropy of the copper block with time is best illustrated by

One end of a rod of length L and crosssectional area A is kept in a furnace at temperature T_(1) . The other end of the rod is kept at a temperature T_(2) . The thermal conductivity of the matrieal of the rod is K and emissivity of the rod is e. It is gives that T_(!)=T_(s)+DeltaT , where DeltaTltlt T_(s),T_(s) is the temperature of the surroundings. If DeltaTprop(T_(1)-T_(2)) find the proportional constant, consider that heat is lost only by rediation at the end where the temperature of the rod is T_(1) .

Two black bodies at temperatures 327^@ C and 427^@ C are kept in an evacuated chamber at 27^@ C . The ratio of their rates of loss of heat are

Two black bodies at temperatures 327^@ C and 427^@C are kept in an evacuated chamber at 27^@C . The ratio of their rates of loss of heat are :