A laser pulse with wavelength 555 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

Asked by maham237 @ 22/12/2020 in Chemistry viewed by 424 People

Answered by maham237 @ 22/12/2020

Wavelength is the
ratio of speed of light and frequency:

wavelength = speed of
light / frequency

where frequency is: (c
is speed of light)

freq = c / wavelength = 3E8/550E-9 = 5.45E14 Hz

We know that photons have energy E = hf = 6.626E-34 Js * 5.45E14
Hz = 3.61 E-19 J

Therefore if it has 4.40 mJ of energy, the pulse has:
4.40E-3/3.61E-19 = 1.22E16 photons

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