(a) The intensity of radiation is defined as the number of photons incident, per unit surface area per unit time.
(b) The photocurrent curve is given as follows:
(c) Here, curves (1) and (2) have the same frequency and hence the same stopping potential. But the number of photons striking the metal surface or the intensity of (1) is greater than (2). Hence, the number of photoelectrons produced is more for (1) than (2).
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