A pulsed laser emits light at a waveleng...

A pulsed laser emits light at a wavelength of 694.4 nm. The pulse duration is 12 ps, and the energy per pulse is 0.150 J. (a) What is the length of the pulse? (b) How many photons are emitted in each pulse?

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(a) `3.60xx10^(-3)m,` (b) `5.24xx10^(17)` photons

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