## Which Equation Do We Never Use for Light? [ENDORSED]

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

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### Which Equation Do We Never Use for Light?

During Friday's lecture about quantum mechanics, Dr. Lavelle said we should never use a certain equation for light. What is the equation and in what instances do we use it?

Alma Flores 1D
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### Re: Which Equation Do We Never Use for Light?

Dr. Lavelle said that de Broglie's Equation ( lambda=h/p) doesn't apply to light because it measures objects with mass and photons do not have mass.

Marisol Sanchez - 1E
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### Re: Which Equation Do We Never Use for Light?  [ENDORSED]

The equation he said to never use for light was wavelength (lambda) = h(planck's constant)/p(momentum). This is Debroglie's equation and it should be used with any other particles, including atoms, molecules, etc. Just not with light. It basically is meant to suggest that other substances besides light and photons are capable of emitting wavelike properties and we can use this equation to prove it. That's why we should not use it with light because there is nothing to prove regarding whether light does or does not have wavelike properties, we know it does already.

Rummel Requerme 1E
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### Re: Which Equation Do We Never Use for Light?

Lavelle said not to use the deBroglie Equation in regards to light.