Speed of Light (again...)

[Pseudoscientist]

Assumptions:

1) Light bends when it passes a field of gravity, e.g. a planet. Hence light has a mass?
2) Light cannot escape from a black hole because the gravity field of a black hole is so strong.

Question:

Now, let us say there is a “light-black hole” from which light can escape just barely.  Is the starting velocity of the escaping light slower than 300,000,000 m/s until it reaches open space and only after that it really starts to rock’n’roll?

[OceanBreeze]

7 hours ago, Pseudoscientist said:

Assumptions:1) Light bends when it passes a field of gravity, e.g. a planet. Hence light has a mass?

No, light does not have mass but it does have energy. Light moves in a curved line near a large massive body because space itself is curved, but the light is moving locally at c.

 

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2) Light cannot escape from a black hole because the gravity field of a black hole is so strong.

The very large gravity of the BH curves space so much it curves back in on itself. Light following this curvature is still moving locally at c but cannot escape from the event horizon of the BH.

 

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Question:

Now, let us say there is a “light-black hole” from which light can escape just barely.  Is the starting velocity of the escaping light slower than 300,000,000 m/s until it reaches open space and only after that it really starts to rock’n’roll?

 

If the curvature of space allows a path for light to escape, it will escape moving at c.

[phillip1882]

in my understanding, only atoms have mass. light is made up of quarks, which are mass-less.

light bends from a black hole because it is made up of particles.

light should be constant even near a black hole.

i'm no expert though so take this with a grain of salt.

[OceanBreeze]

The massless elementary particle of light is the photon, not the quark.

A quark is an elementary particle of matter, and has mass.

From Wikipedia:

“The Standard Model posits that elementary particles derive their masses from the Higgs mechanism, which is associated to the Higgs boson. It is hoped that further research into the reasons for the top quark's large mass of ~173 GeV/c2, almost the mass of a gold atom, might reveal more about the origin of the mass of quarks and other elementary particles”

 

[CountryBoy]

When you say that light has no mass, it  certainly has energy and, as you titled your  other thread, E= mc^2, so it really makes no difference.