The power of a red laser (λ = 630 nm) is 3.25 watts (abbreviated w, where 1 w = 1 j/s). how many photons per second does the laser emit?

The number of photons per second emitted by the laser is .

The energy of a single photon of the red laser is calculated as follows;

The number of photons per second emitted by the laser is calculated as follows;

Power of the laser = 3.25 W = 3.25 J/s

Thus, the number of photons per second emitted by the laser is .

Learn more about energy of emitted photons here: link

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so easy. just google the electromagnetic waves and it’ll pop up.