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6. The laser light emitted in ruby laser has a wavelength of 7000A and the total number of Cr3+ ions is 2.8 x 1019. Calculate

6. The laser light emitted in ruby laser has a wavelength of 7000A and the total number of Cr3+ ions is 2.8 x 1019. Calculate the energy of a photon and total energy available per laser pulse

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