Gravitional field is only applicable to object wifth mass.
Light can't escape from black hole.
2006-09-25 06:55:35 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Photons have no mass, however it is affected by gravity, but not in the way that you would think. You see, our current understanding of gravity is that it is a warping, or bending, of space and time into a kind of 4 dimensional cone around the object of mass. Now, light will always travel in a straight path through time and space. When light passes near enough to a very massive object, light is still traveling in a straight path along the surface of time and space, but because time and space is "funnelled" near large objects, the path of the light appears to bend, much like lens. Now, if the object is really massive, like a black hole, it will bend space so much, that the straight path will not be able to escape from the curvature. So, it's not that light is directly affected from the black hole as are other objects of mass, that is there is no mutual attraction, but rather it is indirectly affected due to the curvature of space near massive objects.
2006-09-25 07:06:55 · answer #1 · answered by ohmneo 3 · 7⤊ 2⤋
"If gravitational strength is determined by mass, how then does a star have less gravity than the black hole that is created from its collapse?" It doesn't. Gravity is also determined as a function of distance as well as mass. A black hole doesn't necessarily have "more gravity". If the sun were collapsed into a black hole somehow, the Earth would still stay in orbit around it the same way it does now. The gravity wouldn't change (or the mass!), just the volume.
2016-03-17 03:11:00 · answer #2 · answered by Anonymous · 0⤊ 0⤋
remember De-brogli'e theory.
according to it, light has dual nature.
light particle has no mass.
still light can be a wave and a wave has directionality.
when a light wave enters a black hole, it has no other way of getting out of the hole.
it's not due to the gravitational field that light can't escape from the black hole.
i will give you a small experiment.
you take a completely closed box made of an opaque substance.
you make a hole on any of the side and let a light ray pass through it.
you do not observe the light coming out of the box.
this is what happens in the case of a black hole.
the black hole acts like the box we have taken in our experiment and hence gravity doesn't play any part in the absorption of light.
2006-09-28 01:33:04 · answer #3 · answered by raghuramkasyap c 1 · 0⤊ 0⤋
Does Light Have Mass
2016-09-30 06:47:45 · answer #4 · answered by ? 4 · 0⤊ 0⤋
How would you like to be struck by trillions of particles with mass moving at 300KM per second. Seems like a flash light would kill you and the earth would be blown out of orbit doesn't it. Sometimes these formulas don't work well in real life.
Think of space as a moving gel consisting of gravity from everything in the universe with atoms about 1cm apart suspended in the gravitational gel like grapes in jello. Drop a star into the gel and notice that as it pushes the gel out of the way, its gravitational effects compress the gel around its surface drawing the atoms closer together and then, as the star passes by, the gel decompresses and the atoms are moved back close to their original positions. If you shine a light past the edge of the star, as the light finds its path past all of the suspended atoms, you will notice that the light is deflected towards the star by the atoms moving towards it and then deflected back towards its original path by the decompressing space gel as it passes the star. The light has been deflected as it passed the star but not actually drawn or pushed towards the star by its gravitational effects.
It has been shown that light can escape from a black hole. usually, perhaps, the amount and speed of the matter entering the black hole deflect any light back towards it.
2006-09-26 03:27:22 · answer #5 · answered by Anonymous · 1⤊ 1⤋
Electromagnetic energy is able to be formed directly into mass, as when a high frequency photon enters near the nucleus of an atom and is converted into an electron. At that time the photon becomes mass. The photon has the same potential of gravitational attraction as does the electron, but its speed causes the time lapse in the gravitational field to be very slight, whereas an electron is able to remain within any given field for an indefinite period of time.
There is a short writing, "The Problem and Repair of Relativity" found at http://360.yahoo.com/noddarc that deals with mass movement and relativity, if you are interested.
2006-09-25 08:36:27 · answer #6 · answered by Anonymous · 2⤊ 0⤋
Yes. Photons are particles with a zero rest mass. That means if they are not moving (they are at rest) they have zero mass, however, it also means that if they are moving (and they move with a velocity of 300K Meters / Second), then they do have mass. Where does the mass come from? It comes from their momentum. Any moving object has momentum which can be calculated as mass. E=MCsquared Therfore light does have mass and is affected by gravity.
2006-09-25 07:18:01 · answer #7 · answered by Anonymous · 4⤊ 2⤋
If you fire a reasonably powerful laser pulse at a sheet of white paper, you will hear it hit the paper. If you put your hand behind the sheet of paper you can feel it. This indicated that there is mass involved.
It is probably reasonable to say that the "rest mass" of a photon is zero and it only takes on a mass when it is moving. This always appears to me to be a bit of nonsense that demonstrates that we do not really understand.
2006-09-25 07:16:28 · answer #8 · answered by Stewart H 4 · 2⤊ 4⤋
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2016-07-10 22:35:12 · answer #9 · answered by Sheri 3 · 0⤊ 0⤋
Photons do not have mass but they do have momentum.
2006-09-25 07:36:17 · answer #10 · answered by christopher N 4 · 1⤊ 1⤋