photons are massless particles though they are said to possess energy do this violates special theory of relativity explain ???
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Answers
In physics, the special theory of relativity, or special relativity for short, is a scientific theory regarding the relationship between space and time. In Albert Einstein's original treatment, it is based on two postulates:[1][2]
the laws of physics are invariant (i.e., identical) in all inertial frames of reference (i.e., non-accelerating frames of reference); and
the speed of light in a vacuum is the same for all observers, regardless of the motion of the light source or observer.
Answer:
It depends what you mean by mass. Photons have zero "rest" mass. But in nature, there is no photon at rest. All photons have energy that depends on its frequency. We know energy and mass are the different aspects of the same thing. (Einstein's famous formula) Since photons have energy it also means that photons have mass. But note that, their mass is only coming from their energy. Only, their mass is not intrinsic. In short, yes you can say that, photons have mass! In 1920's Einstein's general relativity is verified based on the fact that photons are affected from gravity.
Photons are traditionally said to be massless. This is a figure of speech that physicists use to describe something about how a photon's particle-like properties are described by the language of special relativity.
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