Unit – 1
QUANTUM PHYSICS - MODEL QUESTIONS
Maximum word limit for  MARKS question is 50 words,  MARKS question 100
words and  MARKS question 400 words.
 Write statement of Heisenberg’s uncertainty principle..
 What are the properties of wave function for matter waves.
 What is wave packet?
 Why visible light source is not used in Compton scattering experiment.
 Define group velocity and phase velocity
 Derive the operator for momentum.
 The momentum of an electron is 5×10-27 kg/s and is measured to an accuracy of 0.003%.
Calculate uncertainty in determining the position of the electron.
 An X-ray photon of wavelength 0.4 A0 is scattered through an angle of 450 by a loosely
bound electron. Calculate the wavelength of scattered photon.
 Calculate the energy difference between the ground and first excited state for proton if the
length of potential well is 10-8 cm.
 Derive Schrodinger’s time independent and time dependent wave equation for matter
 Obtain energy level and wave function expression for a particle trapped in infinitely Deep
Square well potential.
 Define group velocity and phase velocity. Prove that vp× vg = c2.
 State and explain the Heisenberg uncertainty principle. Illustrate it with the help of an
 What is Compton Effect? Derive the Compton shift expression, discuss the various
possibilities of X- ray scattering.
 Derive the Compton shift expression. a photon of wavelength 0.1A o is scattered by an
electron calculate the maximum KE of the recoil electron.