# Two Problems in Modern Physics

1;A cathode plate is heated up to 300Â±C. What is the de Broglie wavelength of electrons it emits?

2.Show that the laws of energy and momentum conservation forbid the complete absorption of a photon by a free proton.

https://brainmass.com/physics/photons/two-problems-modern-physics-457990

#### Solution Summary

We solve problems involving the de Broglie wavelength of a beam of electrons and photon absorption.

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