Calculate the mass of ice required to lower the temperature of 300 g of water at 40°C to water at 0°C. (Specific latent heat of ice = 336 J g^-1, Specific heat capacity of water = 4.2 J g^-1 °C^-1)

What do you understand by the following statements :

(i) The heat capacity of the body is 60 J K^-1.

(ii) The specific heat capacity of lead is 130 J kg^-1 K^-1

A boy uses blue colour of light to find the refractive index of glass. He then repeats the experiment using red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Copy the diagram given below and complete the path of light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary.