If we go on increasing the wavelength of light on a metal surface, what changes in the number of electrons

The wavelength of a beam of light is 25 micrometer. What is its wavenumber ?

What changes on polarisation of light?

What is the advantage in choosing the wavelength of light radiation as a standard of length?

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.

What happens to the wavelength of light when it goes from rarer to denser medium?

The wavelength of a beam of light is 25 micrometer. What is its frequency ?

In a Young's double slit experiment,12 fringes are observed to be formed in a certain segment of the screen,when light of wavelength 600 nm is used.If the wavelength of light is changed to 400 nm ,number of fringes observed in the same segment of the screen is given by

How the speed of light in vacuum is affected by the change of wavelength of light?