Respuesta :
When we assume spring to be massless then the f.stretching of the spring will be negligible. But when If the spring has mass then it will not be negligible. So, in this case, we can assume that the mass of Spring is negligible as it will rarely contribute to the period of oscillation.
All the relativistic mass of the photon comes from its energy. In particle physics when we say mass, we generally discuss with the rest mass. that is why we usually say that photons are massless.
In particle physics, a massless particle is a primary particle whose invariant mass is zero. The 2 known massless debris are each gauge bosons: the photon and the gluon. but, gluons are never determined as loose particles, seeing that they're confined within hadrons.
The two debris physicists understand to be (at least approximately) massless—photons and gluons—are each force-carrying debris, additionally called gauge bosons. Photons are associated with electromagnetic pressure, and gluons are related to strong pressure.
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