this post was submitted on 11 Mar 2024
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You know that old E=mc² equation? That's actually only the simplified "rest" half of it. The full equation that relativity gives us says E²=m²c⁴+p²c². Meaning if it has energy, it definitely has mass (m), momentum (p), or both.
For a massless particle like a photon, that means E=pc, and its momentum is proportional to its energy and therefore frequency/wavelength.