If you increase the speed of a proton?

Question

to 99.9997% of the speed of light, then it's mass grows by some 430 times bigger than the original size. So if a photon goes the speed of light, what was it's mass at rest and what is it's mass at the speed of light?

Thanks Steve B but I do fully understand the equations, but only to their limited point. Although the E=mc2 equation would indicate that a photon would be massless, then how would gravity affect light passing a planet or blackhole. So at this point, it must boil down to "what is inertia" or "why do objects have it in the first place"? You're welcome to edit your answer Steve to expand on the topic and answer this added question.

Forgot to say, it is believed that the Gluon, Graviton, Neutrino and Photon are massless. I believe that these do have mass, albeit of insignificant value. Of all the reading I've done, massless particles, inertia and gravity stump me.

Answer 1

a proton is a subatomic particle with mass. the proton can never achieved lightspeed(C) aswell as the mass(M) increasing to infinity so would the energy(E).
E=MC2
in other words there isn't enough energy in the universe to push a particle with ever increasing mass up to lightspeed.

a photon is a light particle but it's massless it's never at rest but always traveling at lightspeed.

now i can see your dilemma and i think i might be able to explain this.
if Newton's theory of gravity was correct you would be right in assuming that a photon has mass and in our everyday snail like speeds it does give us very accurate readings.

newton assumed that a object of mass exerts a force onto another object of mass but did not know why.

however Einstein theory of relavitity tells us why and more which change physics forever. an object of mass warps flat space (the bigger the mass the bigger that space is warp) this has been proven many times. effectively objects are caught in the warp space of each other. i.e. the sun warp space more than the earth and therefore the sun influence our orbit more than the earth influence the sun.
in flat space the sun would leave a dent (warp) in it (something like a bowling ball on a flat rubber sheet). so a photon would have to climb over the dent to get to us. or the escape velocity of the sun is 42.1 m/s the velocity of a photon is 299792458 m/s. at these speeds the photon is hardly affected by warp space.
now if the mass of the sun increase so would the warpness of space as would the escape velocity. that dent in the fabric of space would get deeper and curving the linear path of the photon.
now if the increasing mass of the sun turns it into a black hole the dent is so deep that space is curve back onto itself aswell as the path of the photon. so it the warpness of space around an object of mass thats affects the path of the photon rather than newtons concept of gravity.
i hopes this helps.
.

Answer 2

Protons have mass, therefore they cannot move at the speed of light, they can only be accelerated to very near the speed of light. At rest, a protons mass is 1.6726 × 10^−27 kg.

Photons, on the other hand are already travelling at the speed of light (in a vaccuum) therefore, according to the theory of relativity they cannot have a mass at rest. It is entirely possible that photons are not really particles at all, this still has to be proven one way or another. At the speed of light the proton's mass is zero.

Answer 3

A consequence of relativity is that only massless particles can reach the speed the light.

Since photons have no mass then they are able to travel at the speed of light. Photons cannot exist at rest.

Likewise, since protons have a definite mass then they cannot travel at the speed of light. They can get very close but not to the speed of light.

Answer 4

Proton - yes, you are correct.

Photon - maybe you haven't quite understood the equations - anything with non-zero rest mass that travelled at the speed of light would have infinite mass ... it thus follows that anything that DOES travel at the speed of light can ONLY have ZERO rest mass (and thus zero mass at any speed).

Answer 5

I thought a Proton was a make of car