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Solution: The power of a red laser (λ = 630 nm) is 2.50 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?

Problem

The power of a red laser (λ = 630 nm) is 2.50 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?


Solution

We’re being asked how many photons per second are being emitted by a red laser with a wavelength of 630 nm with a power of 2.50 watts


Recall that the energy of a photon (E) is given by:


E=hv (1)


where:

h = Planck’s constant (6.626 × 10–34 s)

v = frequency (in s–1)


Also, recall that the frequency (v) and wavelength (λ) are related:


λ=cv (2)


where:

c = speed of light (3.0 × 108 m/s)


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