NCERT Physics Class 12 Exemplar Ch 11 Dual Nature of Radiation and Matter Part 4
Doorsteptutor material for NSO Class-2 is prepared by world's top subject experts: fully solved questions with step-by-step explanation- practice your way to success.
27 A student performs an experiment on photoelectric effect, using two materials A and B. A plot of is given in Fig...

Photoelectric Effect, 2 Materials a and B
(i) Which material A or B has a higher work function?
(ii) Given the electric charge of an electron , find the value of h obtained from the experiment for both A and B. Comment on whether it is consistent with Einstein’s theory:
Ans:
Stopping potential at a higher frequency for B. Hence it has a higher work function.
Slope
Since h works out differently, experiment is not consistent with the theory.
28 A particle A with a mass is moving with a velocity v and hits a particle at rest (one dimensional motion). Find the change in the de Broglic wavelength of the particle A. Treat the collision as elastic.
Ans:
or