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a) What are the energies in electron volts (eV) of light at wavelengths 850, 1310, 1490, and 1550 nm? b) Consider a 1-ns pulse

a) What are the energies in electron volts (eV) of light at wavelengths 850, 1310, 1490, and 1550 nm? b) Consider a 1-ns pulse with a 100-nW amplitude at each of these wavelengths. How many photons are in such a pulse at each wavelength?

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