Given two points sources having same power of 200W.One source is emitting photons of `lambda_1 = 500 nm ` and other emitting X-rey photons of `lambda_2 = 1nm`. Find ratio of photon emitted from both sources.

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 .

There are two sources of light, each emitting with a power of 100W. One emits X-rays of wavelength 1nm and the other visible light at 500nm. Find the ratio of number of photons of X-rays to the photons of visible light of the given wavelength?

A point source of constant power P is emitting photon of wavelength lambda . What is the intensity of photons at r distance from the source ?(speed of light = c)

There are two source of light, each emitting with a power fo 100W , One emits X -rays of wavelength 1nm and the other visible light at 5400nm . Find the ratio of number of photons of X-rays to the photos of visible light of the given wavelength?

Two sources A and B have same power . The wavelength of radiation of A is lambda_a and that of B is lambda_b .The number of photons emitted per second by A and B are n_a and n_b respectively, then

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is 100//cm^(3) .

An atom absorbs a photon of wavelength 500nm and emits another photon of wavelength 700nm. Find the net energy absorbed by the atom in the process.

A monochromatic source emits light of wavelength 550 nm is emitted by a source . Find the number of photons emitted by the source in 90 seconds if power of source is 60 W.