A laser pulse with a wavelength of 525 nm
nm contains 4.40 mJ
mJ of energy. How many photons are in the laser pulse?
The laser pulse in this question has a wavelength of
. To solve this problem, we first have to calculate the energy of a single photon in the laser pulse. The equation for calculating the energy of a single photon of an electromagnetic wave is where
is the speed of light, is planks constant and is the wave length of the photons.
= 1.16 × 1016 photons
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