Question: A ruby laser puts out a pulse of red light at a wavelength of 694 nm. (The ruby laser is described in the essay on

A ruby laser puts out a pulse of red light at a wavelength of 694 nm. (The ruby laser is described in the essay on p. 226.) If a pulse delivers 1.05 × 10⁵ watts of power for 280 цs, how many photons are there in this pulse? (1 watt = 1 J/s.)

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