White or shining bodies are good reflectors of radiant energy

Good reflector of sound:

A good reflector absorbs lots of radiant energy.

The absorption of radiant energy causes

The absorption of radiant energy causes

These question consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five responses. Assertion: If a body is good absorber of green light then it will be good reflector or red light. Reason: At a given temperature, the ratio of emissive power to absorptive power is same for all substances.

An incandescent lamp consumint P=54W is immersed into a transparent calorimeter containing V=10^3cm^3 of water in 420 s the water is heated by 4^@C . The percentage of the energy consumed by the lamp that passes out of the calorimeter in the form of radiant energy is

Assertion : All bodies emit radiant energy whether they are solid, liquid or gases. Reason : Black bodies absorb and emit radiant energy better than bodies of lighter colours.

An electric heater whose power is 54 W is immersed in 650cm^3 water in a calorimeter. In 3 min the water is heated by 3.4^@C . What part of the energy of the heater passes out of the calorimeter in the form of radiant energy?

Assertion : When temperature of a body is increased, in radiant energy, number of low wavelength photons get increased. Reason : According to Wien's displacement law lambda_m prop 1/T .

Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength. Reason : According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength