Explain with reason: When the wavelength of incident light is decreased, the velocity of emitted photo elec trons increases

Explain with reason: Green light emit electron from certain metal surface while yellow light does not

In a photoelectric effect experiment the threshold wavelength of the light is 380nm. If the wavelength of incident light is 260nm, the maximum kinetic energy electrons will be: Given E(ineV)= 1237/λ(innm)