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Does a photon have mass?
Film that greatly expands the limits of knowledge for an average bread eater (Polish subtitles). In short: - There is no evidence for the masslessness of light. - The speed of light c in the Special Theory of Relativity is not the speed of light but the speed of causality; massless particles must move at that speed. Therefore, if photons are massless, that is their speed. - If the mass of a photon exists, it is beyond our research capabilities; practically speaking, a photon is considered massless. However, there was a time when we believed neutrinos to be massless. (2) Why No One Knows If Photons Really Are Massless: What if they Aren't? - YouTube
Film that greatly expands the limits of knowledge for an average bread eater (Polish subtitles). In short: - There is no evidence for the masslessness of light. - The speed of light c in the Special Theory of Relativity is not the speed of light but the speed of causality; massless particles must move at that speed. Therefore, if photons are massless, that is their speed. - If the mass of a photon exists, it is beyond our research capabilities; practically speaking, a photon is considered massless. However, there was a time when we believed neutrinos to be massless. (2) Why No One Knows If Photons Really Are Massless: What if they Aren't? - YouTube
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