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Jakob Littel

Feb 20, 2025

A laser pulse with wavelength 505nm contains 4.85mJ of energy.?

How many photons are in the laser pulse?
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3 Answers

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Hermina Ferry

Feb 20, 2025

1 photon will have an energy of hc/lambda = (6.63 x 10^-34Js x 3 x 10^8m/s)/505 x 10^-9m = 3.94 x 10^-19JTherefore the No. of photons that have a total energy of 4.85mJ = (4.85 x 10^-3)/(3.94 x 10^-19) = 1.231 x 10^16 photons... Show More
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H
Hermina Ferry

Feb 20, 2025

IF the wavelength of the laser pulse is 505nm, the energy possessed by a single photon will be given by {hc/wavelength}, where h=Planck’s Constant= 6.62 x 10 power -34 Js, c=Speed of Light = 3 x 10 power 8 m/s. And the wavelength is given. Substitute in the Planck’s equation and find out the energy of a single photon (lets say it to be x J). Now u have the value for the whole pulse. Divide the value (4.85 MJ) with the energy of the single photon and calculate the number of photons! P.S. The energy of the laser pulse cannot be such a small value (mJ=milli Joule). Check out the question properly…It has to be MJ=Mega Joule. Milli is 10 power -3 and Mega is 10 power 6.... Show More
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