Find number of photons coming out per unit time of source that emits a light of wavelength 900nm of intensity `100 W/m^2` through its surface area of `1 m^2` (in multiple of `10^19`)

The number of photons emitted per second by a 62W source of monochromatic light of wavelength 4800 A^(@) is

Find the number of photons emitted per second by a 25 watt source of monochromatic light of wavelength 6000Å .

The number of photons emitted per second by a 60 W source of monochromatic light of wavelength 663 nm is: (h=6.63xx10^(-34)Js )

Find the number of photons emitted per second by a MW transmitter of 10 kW power emitting radiowaves of wavelength 500 m .

(a) Calculate the momentum of a photon of light of wavelength 500 nm. (b) Find the number of photons emitted per second by a 25 W sourse of monochromatic light of wave length 600 nm. (c) How many photons per second does a one watt bulb emit if its efficiency is 10% and the wavelength of light emitted is 500 nm? (d) Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm^(2) . If the intensity of light is 150 m W//m^(2) , determine the rate at which photons strike the surface.

A monochromatic source emits light of wavelength 500 nm and has a power output of 25 W. Find the number of photons emitted by this source in 5 minutes .

A parallel beam of uniform, monochromatic light of wavelength 6600 Å has an intensity of 900 Wm^(-2) . The number of photons in 1 mm^3 of this radiation are 1xx 10^(X) then find out value of X.

A 100 W point source emits monochromatic light of wavelength 6000 A Calculate the total number of photons emitted by the source per second.

The light intensity 10 m from a point source is 1000 W/ m^(2) . The intensity 100 m from the same source is

A beam of ligh incident on a surface has photons each of energy 1 mJ and intensity 25w//cm^(2) . Find number of photons incident per second if surface area of 25cm^(2)