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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A cylindrical rod of some laser material 5 * 10^-2 m long and 10^-2 m in diameter contains 2 * 10^25 ions per m^3. If on excitation all the ions are in the upper energy level and

A cylindrical rod of some laser material 5 * 10^-2 m long and 10^-2 m in diameter contains 2 * 10^25 ions per m^3. If on excitation all the ions are in the upper energy level and

A cylindrical rod of some laser material 5 * 10^-2 m long and 10^-2 m in diameter contains 2 * 10^25 ions per m^3. If on excitation all the ions are in the upper energy level and