List the salient feature of heat radiations

Two spheres made of same meterial have radii in the ratio 1:2 both are the same temperature Ratio of heat radiation energy emitted per sec by them is

Write two advantages in choosing the wavelength of a light radiation as a standard of length.

State two features of chemical adsorption which are not found with physical adsorption.

Can by increasing the intensity of incident radiation, velocity of emitted electron be increased?

How does stopping potential vary on increasing the intensity of incident radiation?

About 10% of the power of a 100W light bulb is converted to a visible radiation. What is the average intensity of visible radiation. at a distance of 10 m?

About 10% of the power of a 100W light bulb is converted to a visible radiation. What is the average intensity of visible radiation. at a distance of 1m from the bulb?

What is meant by the thermal radiation?