X-rays of wavelength 0.82Å fall on a metal plate. Find the wavelength associated with photoelectron emitted. Neglect work function of the metal.
Given `c=3xx10^8 m//s h=6.63xx10^(-34)Js.`

Find de-Broglie wavelength associated with an electrons moving with velocity 0.6 C. Given, rest mass of electron = 9.1 xx 10^-31 kg , h=6.63 xx 10^-34 Js .

A light of wavelength 5000 Å falls on a photosensitive plate with photoelectric work function 1.90 eV. Kinetic energy of the emitted photoelectrons will be (h = 6.63 xx 10^(-34)J.s)

Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2 V potential stops the emitted electrons. The work function of the material ( in eV) is approximately ( h = 6.6 xx 10^(-34) Js , e = 1.6 xx 10^(-19) C , c = 3 xx 10^(8) ms^(-1))