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:
h = Planck’s constant (6.626 × 10–34 J • s)
v = frequency (in s–1)
Also, recall that the frequency (v) and wavelength (λ) are related:
c = speed of light (3.0 × 108 m/s)
A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy in Joules of a single photon in this light?
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