p = mv and since the mass of photon = 0, then why is it that photon or other massless elementary particles can have a momentum?
2006-09-10 19:07:35 · 7 answers · asked by KeenaUsas 1 in Science & Mathematics ➔ Physics
Photon has zero rest mass only . But as it it is moving with velocity of llight we talk about effective mass. In theories of relativity if any particle is moving with speed in comparison to speed of light we talk about effective mass not rest mass.
2006-09-10 22:18:31 · answer #1 · answered by Lovleena G 2 · 0⤊ 0⤋
rest mass of a photon: 0.0000000000000006 electron volts, essentially zero.
a photon isn't directly effected by the stars mass, space is distorted by the stars mass thus effecting the photons path.
2006-09-11 02:26:09 · answer #2 · answered by hogie0101 4 · 0⤊ 0⤋
If it moves, it has momentum. Because the bending of light waves occurs as they pass a strong gravitational field, photons have mass.
2006-09-11 02:13:15 · answer #3 · answered by RG 4 · 0⤊ 1⤋
photon's rest mass is zero
because it doesn't rest at all
photon exist only if it moves as light
and during movement it has mass and momentum
2006-09-11 02:15:59 · answer #4 · answered by Eugene 2 · 0⤊ 0⤋
Photons are not massless in exact sense; they are massless only in comparision to other subatomic particles i.e. protons and neutrons etc. Afterall, the world lies in RELATIVITY.
2006-09-11 02:51:02 · answer #5 · answered by yogen p 2 · 0⤊ 0⤋
the photons are packets of energy and it have momentum,,,,, the weight of photon is taken to be zero,,,,,,but it is not zero,,,,,
2006-09-11 02:16:38 · answer #6 · answered by Anonymous · 0⤊ 0⤋
it has mass but it is so small that it is normally neglected
2006-09-11 08:24:44 · answer #7 · answered by arch v21 2 · 0⤊ 0⤋