NCERT Physics Class 12 Exemplar Ch 11 Dual Nature of Radiation and Matter Part 4

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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.

Photoelectric Effect, 2 Materials a and B

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(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.

  1. 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