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A laser pulse with wavelength 510 nm contains 4.85 mJ of energy. How many photons are in the laser pulse?

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The energy of a laser pulse can be determined by `E=n*h*nu` , where n is the number of photons, h is the Planck's constant and `nu` is the frequency of the laser pulse, which is related to its wavelengths.`<br> `

The Planck's constant is

`h=6.626*10^(-34) J*s`

and the frequency...

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