Differentiate between heat capacity and specific heat capacity. 

A hot solid of mass 60 g at 100^o C is placed in 150 g of water at 200^o C. The final steady temperature recorded is 25^o C. Calculate the specific heat capacity of the solid.

33.

i) Write an expression for the heat energy  liberated by a hot body.

ii) Some heat is provided to a body to raise the temperature by 25^o C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?

iii) What happens to the average kinetic energy of the molecules as ice melts at 0 degree C?

A piece of ice at 0^o C is heated at a constant rate and its temperature recorded at regular intervals till steam is formed at 100^o C. Draw a temperature-time graph to represent the change in phase? Label the different parts of your graph. 

40 g of ice at 0^o C is used to bring down the temperature of a certain mass of water at 60^o C to 10^oC. Find the mass of water used. 

i) What is the value of the speed of gamma radiations in air or vacuum?

Give any two important sources of background radiation. 

i) Draw a simplified labelled diagram of a hot cathode ray tube.

i) What is meant by the term critical angle?

ii) How is it related to the refractive index of the medium?

A ray of light PQ is incident normally on the hypotenuse of a right-angled prism ABC as shown in the diagram alongside:

                                            

i) Copy the diagram and complete the path of the ray PQ till it emerges from the prism?

ii) What is the value of the angle of deviation of the ray?

iii) Name an instrument where this action of the prism is used?