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What is intensity?? |
| Answer» Luminous\xa0intensity, the quantity of visible\xa0light\xa0that is emitted in unit time per unit solid angle. The unit for the quantity of\xa0light\xa0flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen.\xa0The\xa0intensity\xa0is defined as power per unit area, and power is defined as energy per unit time. Thus: I=PA=EΔt1A.\xa0Because when\xa0intensity of incident light\xa0increases, it means that number of photons increases in\xa0incident light. If number of\xa0incident\xa0photons increases, then number of emitted photo electrons also increases, consequently the photo electric current increases. | |