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What would it take to make photons without momentum? How would they behave?

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The momentum of a photon is given by:

$$ p = \frac{h}{\lambda} $$

so all photons have a momentum and there is no way to make the momentum zero. You can make the momentum arbitrarily small by making the wavelength $\lambda$ arbitrarily large, but the momentum can never become zero.

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  • $\begingroup$ Wouldn’t momentum be zero if the wavelength was universe sized? $\endgroup$
    – Euphorbium
    Jun 11 at 5:50
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    $\begingroup$ @Euphorbium The momentum would be very small, but it wouldn't be zero. $\endgroup$ Jun 11 at 6:26

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