A laser emits light of wavelength

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A 5 mW5\,\text{mW} laser emits light of wavelength 632.8 nm632.8\,\text{nm}. Determine the number of photons emitted per second. (h=6.63×10−34 J sh = 6.63 \times 10^{-34}\,\text{J s}, c=3.0×108 m s−1c = 3.0 \times 10^{8}\,\text{m s}^{-1})

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