## Photon Energy - The Energy of Light Particles

Here you will learn how to determine energy of photons and how this energy depends on the color of light (frequency or wavelength).

Photons, wave functions and the world of the small.

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Lesson ## Photon Energy - The Energy of Light Particles

Here you will learn how to determine energy of photons and how this energy depends on the color of light (frequency or wavelength).

## Questions & Answers

## Related formulas

Formula ## Photon (Energy, Frequency)

`$$ W_{\text p} ~=~ h \, \class{violet}{f} $$`Formula ## Photon (Energy, Wavelength)

`$$ W_{\text p} ~=~ h \, \frac{c}{\class{violet}{\lambda}} $$`Formula ## Photon (Momentum, Wavelength)

`$$ p ~=~ \frac{h}{\class{violet}{\lambda}} $$`Formula ## Photon Energy Per Mole (Wavelength)

`$$ W_{\text{mol}} ~=~ N_{\text A} \, h \, \frac{c}{\lambda} $$`Formula ## Photon Energy Per Mole (With Frequency)

`$$ W_{\text{mol}} ~=~ N_{\text A} \, h \, f $$`## Related Illustrations

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Lesson ## Photoelectric effect: How to understand the revolutionary experiment just like Einstein did

Here you will learn how the photoelectric effect is explained quantum mechanically, how the stopping voltage method works and everything else you need to know.

## Related formulas

Formula ## Photon (Energy, Frequency)

`$$ W_{\text p} ~=~ h \, \class{violet}{f} $$`Formula ## Photoelectric Effect (Energy, Work Function, Velocity)

`$$ h \, \class{violet}{f} ~=~ \frac{1}{2} \, m_{\text e} \, v^2 ~+~ \class{gray}{W} $$`Formula ## Photoelectric Effect (Work Function, Stopping Voltage, Frequency)

`$$ W ~=~ h \, f ~-~ e \, U_{\text G} $$`Formula ## Photoelectric Effect (Cutoff Frequency, Work Function)

`$$ W ~=~ h \, \class{red}{f_0} $$`Formula ## Photoelectric Effect (Cutoff Wavelength, Work Function)

`$$ W ~=~ h \, \frac{c}{\class{red}{\lambda_0}} $$`## Related Illustrations

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Lesson ## De Broglie Wavelength of Matter Waves

Here you will learn about matter waves and how they are characterized by the de Broglie wavelength (matter wavelength).

## Related formulas

Formula ## De Broglie wavelength (mass, velocity)

`$$ \lambda ~=~ \frac{h}{m \, v} $$`## Related Illustrations

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Derivation ## Uncertainty Relation Using a Single Slit

Derivation of the Heisenberg uncertainty relation for momentum and position using a single slit through which many electrons pass and for which the De Broglie relation holds.

## Related formulas

Formula ## Uncertainty Relation (Position, Momentum)

`$$ \Delta x \, \Delta p ~\geq~ \frac{h}{4\pi} $$`## Related Illustrations

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Derivation ## Compton Scattering

Derivation of the formula for wavelength for the Compton scattering, where a photon collides with an electron.

## Related formulas

Formula ## Compton Scattering (Wavelength Difference, Compton Wavelength, Angle)

`$$ \Delta \lambda ~=~ \lambda_{\text C} \, \left( 1 ~-~ \cos(\theta) \right) $$`Formula ## Compton Scattering (Wavelength, Scattering Angle)

`$$ \lambda' ~-~ \lambda ~=~ \frac{h}{m \, c } \, \left( 1 ~-~ \cos(\theta) \right) $$`## Related Illustrations