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For example, 20hz vs. 400ghz electromagnetic waves.

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- Thread starter nuby
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- #1

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For example, 20hz vs. 400ghz electromagnetic waves.

- #2

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The energy of a photon, E (which can be considered as all kinetic energy since the proper energy = E

For example, 20hz vs. 400ghz electromagnetic waves.

Pete

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can E=1/2mv^2 be applied to photons ever?

or E=mc^2

or E=mc^2

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:[tex]E^2 = p^2c^2 + m^2 c^4[/tex], which works just fine for photons when [tex]m = 0[/tex].

For ordinary particles, one can Taylor expand [tex]E = \sqrt{p^2c^2 + m^2 c^4}[/tex] to get a non-relativistic equation most people use... but for photons, you can't do this, and [tex]E = pc[/tex] simply.

According to de Broglie, [tex]p = h \nu[/tex], of course.

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