12. A laser generates a pulse of light with an energy of 2.65 mJ. If this pulse contains 2.60 × 1016 photons, what is the wavelength of these photons? (Units: µm) A. 1.95 µm B. 0.195 um C. 2.89 um D. 4.05 um E. None of the above.

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A: Given data contains, Distance travelled is 1.00 billion km.

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A: E = (2.2mol) hc / ( wavelength )  [ NOTE : 1mol = 6.022 • 10^23 and 1nm = 10^-9 m  E = ( 2.2 • 6.022…

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Q: What is the energy (in J)

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A: 1nm = 10-9 mEnergy can be calculated using following formula.

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A: a)

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