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CBSE Class 10 Answered

<div>DOES LIGHT PHOTONS HAVE CAHARGE?DOES LIHGT PHOTONS HAVE MASS[IF NOT ,{CONFUSION IS THAT} IF LIGHT PHOTONS HAVE ENERGY IT SHOULD HAVE MASS ACCORDING TO THEORY OF RELATIVITY (E=mc^2),,, (SO IF IT HAS MAS THEN IT WILL HAVE CHARGE?) ]?Explain this statement and also explain what are light photons made of?</div>
Asked by abinash.gupta003 | 12 May, 2017, 03:02: PM
Expert Answer
A photon does not have mass and neither does it carry any charge. Energy of a particle is given from Einstein's relativistic formula where in only E = mc2 does not apply. The above relation is true only for rest mass energy case, when a particle is at rest. But, photon's rest mass enegry is zero. So, it feels as if a photon emits energy without having mass. But, using relativistic theory for a particle moving close to the speed of light, and photon is actually the one moving at speed of light, the energy is E2 = p2c2 + m2c4 = p2 (as m = 0). Here p = h/λ.
 
Light photons are fundamental particles. So, they are not made up of anything.
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