A brilliant are lamp delivers a liminous flux of 100 w to a `1 cm ^(2)` absorber . The force due to radiation pressure is :

A lamp delivers a luminous flux of 100 w to an absorber of area 1 cm^(2) . The force due to radiation pressure is

Electromagnetic radiation with energy flux 50W cm^(-2) is incident on a totally absorbing surface normally for 1 hour : If the surface has an area of 0.05m^(2) , then the avergae force due to the radiaton pressure, on it is,

A black totally absorbing piece of carboard of area A=2.0 cm^(2) intercepts light with an intensity of 10 W//m^(2) from a camera strobe light . What radiation pressure is produced on the cardboard by the light ?

Sunlight falling vertically on a surface at the sea level has an intensity of 1600Wm^(-2) .Assuming 100% of the incident light is absorbed,the radiation pressure on the surface is

A 100 W sodium lamp is radiating light of wavelength 5890A , uniformly in all directions, a. At what rate, photons are emitted from the lamp? b. At what distance from the lamp, the average flux is 1 photon( cm^2-s)^-1? c. What are the photon flux and photon density at 2m from the lamp?

A 100 W sodium lamp is radiating light of wavelength 5890A , uniformly in all directions, a. At what rate, photons are emitted from the lamp? b. At what distance from the lamp, the average flux is 1 photon( cm^2-s)^-1? c. What are the photon flux and photon density at 2m from the lamp?

The luminous flux of a 1 W sodium vapour lamp is more than that of a 10 kW source of ultraviolet radiation. Comment.

The luminous flux of a 1 W sodium vapour lamp is more than that of a 10 kW source of ultraviolet radiation. Comment.