A laser pulse with wavelength 535nm contains 4.40mJ of energy. How many photons are in the...
A laser pulse with wavelength 535nm contains 4.40mJ of
energy.
How many photons are in the laser pulse?
Homework Answers
wavelength = wavespeed/frequency
freq = c/wavelength =3E8/535E-9 = 5.60E14 Hz
photons have energy E = hf = 6.626E-34 Js * 5.60E14 Hz = 3.71 E-19
J
so if it contains 4.40 mJ of energy, the pulse has:
4.40E-3/3.71E-19 = 1.18E16 photons
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