Answer:
From the observations made (parts A and B) on the basis of Einstein's photoelectric equation, we draw following conclusions : 1. For surface A, the threshold frequency is more than \[\text{1}{{0}^{\text{15}}}\] Hz, hence no photo-emission is possible. 2. For surface B, the threshold frequency is equal to the frequency of given radiation. Thus, photo-emission takes place but kinetic energy of photo-electrons is zero. 3. For surface C, the threshold frequency is less than \[\text{1}{{0}^{\text{15}}}\] Hz. So photo-emission occurs and photo-electrons have some kinetic energy.
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