From the de-Broglie relation, wavelength,λ=ph​…(1)⇒p=λh​​ Here, h= Planck's constantp=momentum of electronIt is clear from the above equation that p∝λ1​.Thus, if the wavelength (λ) is decreased, then momentum (p)will be increase. Relation between momentum and energy:p=2mE​ Here, E= energy of electronm=mass of electronSubstituting the value of p in equation (1), we get:​λ=2mE​h​⇒E​=λ2m​h​⇒E=2mλ2h2​​ Thus, on decreasing λ , the energy will increase.