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Einstein's coefficient A 21 stands for
probability of spontaneous emission per unit time
probability of stimulated emission per unit time
probability of stimulated emission
energy density of radiation
probability of spontaneous emission per unit time
Quick Summary: Practice and solve "Einstein's coefficient A21 stands for..." for Electrical - Electrical Materials. The correct answer is Option A: probability of spontaneous emission per unit time. Detailed step-by-step solution, conceptual clarity, and formulas on Examoogle.
Answer:
Option **(a) **