Question

(3 marks) QUESTION 2 5p a) The energy level diagram for Sodium, Na, is 4.0 shown opposite. ap 3.0 Calculate the exact energy (in electron volts) of the photon emitted when an electron relaxes from the 4p to the 3s level in a sodium atom. 3p 2.0 (2 marks) 1.0F DATA Planck's constant 6.63 10 Js Excitation Atomie emission The speed of light 3.00 x 10 ms" 1 eV= 1.60 x 10-19J b) Explain, with the aid of an Energy-level diagram, the energy changes that occur during (6 marks) absorption, non-radiative relaxation and fluorescence by a molecular species. c) Briefly explain why the relative number of molecules that fluoresce is small. (2 marks)

Answer 1