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  1. Dec 17, 2021 · The addition of the four vectors of two non collinear photons has an invariant mass even if each individual photon has zero mass, thus the built up light will have an invariant mass, within the formalism of special relativity. Experimental proof is the decay of the pi0 to two gamma. The added four vectors of the two gamma have the invariant ...

  2. Feb 23, 2024 · So, does light have mass? The answer is nuanced. While photons, the building blocks of light, do not have mass in the traditional sense, the energy they carry behaves in ways analogous to mass, particularly when interacting with gravitational fields. This duality of light, being both a wave and a particle, and the relationship between energy ...

    • johannes.helmold@academichelp.net
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  3. The complete formula is E= sqrt (m²c⁴+p²c²), where p is the momentum. And as light has an momentum it has an energy. But it has no rest mass (the mass an object has at rest), as according to special relativity it then would not be able to move at speed of light. If it were, it would need infinite energy which is not possible.

  4. Light does have weight, meaning that it is a source of gravitational fields. A box of light weighs more than an empty box. The reason is that ALL forms of energy have weight. However, under ordinary earthly conditions, the weight of light is insignificant compared to other weights. That is a very interesting question!

  5. Jun 18, 2024 · A visualization of a blinking pulsar. (NASA/Goddard Space Flight Center) We have a new upper limit for the mass of light. According to measurements of pulsing stars scattered throughout the Milky Way and mystery radio signals from other galaxies, a particle of light – called a photon – can be no heavier than 9.52 × 10 -46 kilograms.

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  7. May 20, 2016 · It has no mass, but can still be absorbed, reflected, or refracted if it comes in contact with a medium. And in the end, the only thing that can truly slow down or arrest the speed of light is ...

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