If the wavelength of a beam of light is decreased what happens to the momentum of the photons

the momentum is increased

Energy and momentum are conserved, this was proved by he American physicist Arthur H. Compton after his experiments related to the scattering of photons from electrons (Compton Effect), in which he also proved that photons do have momentum.

So, this momentum is given by the following expression:

Where is the Planck constant and is the wavelength of the photon.

As we can see, the momentum is inversely proportional to to the wavelength. This means, if decreases, increases.

im sorry i dont know