Answer to Question #58598 in Quantum Mechanics for sajid
Q. Show that energy E of a photon having wavelength λ can be written as E= (1240ev/ λ)nm.
Q. The energy needed to remove an electron from metallic sodium is 2.28ev. Does sodium show photo electric effect for red light having wavelength λ= 678 nm. What is cut off wavelength for photoelectric emission from sodium?