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QPage 363: Q2: HC Verma: Concepts of Physics - Volume 2 Photoelectric Effect and Wave-Particle Duality Page 363: Q2 Solution: Is it always true that for two sources of equal intensity, the…

Is it always true that for two sources of equal intensity, the number of photons emitted in a given time are equal?

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**Answer:** No, it is not always true that for two sources of equal intensity, the number of photons emitted in a given time are equal. **Step-by-Step Explanation:** The number of photons emitted per unit time is given by n=IAEn = \frac{I}{AE}, where II is the intensity, AA is the area, and EE is the energy of each photon. If the areas of the sources and the wavelengths of light emitted by the two sources are different, then the number of photons emitted will be different.

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