A calorimater is kept in a wooden box to insulate it thermally from the surroundings .Why is it neccessery?

If ilm is kept in a wooden box, alpha paritlces from a radiactive source outside the box cannot expose the film but beta particles can. Explain.

A sample of liquid in a thermally insulated constant ( a calorimetre ) is strirred for 2 hr. by a mechancal linkage to motor in the surrounding ,for this procees :

A large cylindrical rod of length L is made by joining two identical rods of copper and steel of length ((L)/(2)) each. The rods are completely insulated from the surroundings. If the free end of copper rod is maintained at 100^(@)C and that of steel at 0^(@)C then the temperature of junction is (Thermal conductivity of copper is 9 times that of steel)

A perfectly black sphere of diameter 0.2 m is in thermal equilibrium with the surrounding. What is the temperature of the surrounding, if its rate of absorption of heat energy from the surrounding is 5.67xx4pixx10^(2) watt? [ sigma=5.67xx10^(-8) S.I. units]

A gas kept in an insulated chamber is heated from 30 °C to 75 °C. The density of gas will

A hot utensil (filled with hot water) kept away from flame cools down by transferring heat to surroundings. Name the process of heat transfer involved.

An uncharged metal object M is insulated from its surroundings. A positively charged metal sphere S is then brought neat to M . Which diagram best illustrates the resultant distributions of charge on S and M