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Let us consider the photoelectric effect described on http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html/" [Broken].

A photon has an energy of 2.25 eV and produces a photoelectron effect on a potassium target,

the maximum energy of the photoelectron is 0.50 eV,

indicating the photoelectric threshold of potassium is 1.75 eV.

Calculating the momentum of the photon and phtoelectron gives:

momentum photon = 1.2E-27 N.s

momentum electron = 270E-27 N.s

The quiz is:

Michel

A photon has an energy of 2.25 eV and produces a photoelectron effect on a potassium target,

the maximum energy of the photoelectron is 0.50 eV,

indicating the photoelectric threshold of potassium is 1.75 eV.

Calculating the momentum of the photon and phtoelectron gives:

momentum photon = 1.2E-27 N.s

momentum electron = 270E-27 N.s

The quiz is:

**what happened to the momentum conservation law?**Michel

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