Explain how photon with no mass can travel with speed of light
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Answer:
The speed of light, (or the speed of a photon) in a near-perfect vacuum is exactly 186,282 miles per second. We perceive photons (light) traveling at this speed because they are massless, or have no ‘weight’ (but they do have kinetic energy, more on that in a bit). Every particle in our universe (including photons) move or ‘swim’ through what scientists call “the Higgs field”. As a result of this interaction, particles acquire their mass. Different particles interact with the Higgs field with different strengths, which is why some particles are heavier (have more mass) than others. Photons move through, but do not interact at all with the Higgs field.
Particles that have mass require energy to accelerate them. The closer to the speed of light you get a particle, the more energy is required to go faster. This is because the particles themselves get more massive in proportion to the increased velocity. In short, the faster you go, the heavier you get.
Photon has zero rest mass that's why they are able to travel with speed of light.
Now why Photons have zero rest mass because a particle gets a mass when it interacts with Higgs field. Photons do not interact with Higgs field that's why they have zero rest mass.
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