How many photons of light with a wavelengths of 4000 pm are necessary to procide 1 J of energy?

What is the number of photon of light with a wvelengthof 4000 pm that provide 1 J of energy ?

Assume that 10^(-17) J of light energy is needed by the interior of the human eye to see an object . How many photons of green light (lambda = 495nm) are needed to generate this minimum energy . [h=6.6xx10^(-34) Js]

An electron and a photon each have a wavelength of 1.00 nm. Find the kinetic energy of electron.

An electron and a photon each have a wavelength of 1.00 nm. Find the energy of the photon?

The number of photons of light having wave number 'x' in 10 J of energy source is :

A dye absorbs a photon of wavelength lambda and re - emits the same energy into two phorons of wavelengths lambda_(1) and lambda_(2) respectively. The wavelength lambda is related with lambda_(1) and lambda_(2) as :

An electron and a photon each have a wavelength of 1.00 nm. Find their momenta?

The de-Broglie wavelength of a photon is the same as the wavelength of electron, show that kinetic energy of photon is (2mclambda)/h times the kinetic energy of electron, where m is the mass of electron and c is the velocity of light.

Calculate the mass of a photon of sodium light having wavelength 5894 angstrom and velocity 3 (10*8)ms-1.