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harshit
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Since light has no MASS... Then how does a black hole absorb light?
harshit said:Since light has no MASS... Then how does a black hole absorb light?
jedishrfu said:Welcome to PF!
Actually light does have mass. Its said that light has no rest mass.
harshit said:Since light has no MASS... Then how does a black hole absorb light?
Matterwave said:Light has no mass, as far as we know. Mass only makes sense in the sense of rest mass. Statements such as "light does have mass" are not helpful (nor accurate), in my opinion, especially when talking to someone who is not well versed in physics.
Mordred said:I disagree with this sentiment, your implying that people are unable to understand the distinction and we should answer with incomplete answers.
the mass of a photon is
1*10−18eV/c2
the rest mass is 0
Welcome to PF!harshit said:Since light has no MASS... Then how does a black hole absorb light?
Drakkith said:That is not the mass of a photon. 1x10-18 is the upper limit on any possible photon mass. In other words, if the photon does have mass, it's going to be that value or less.
Mordred said:I disagree with this sentiment, your implying that people are unable to understand the distinction and we should answer with incomplete answers.
the mass of a photon is
1*10−18eV/c2
the rest mass is 0
CharlesMichael said:Matter is viewed in two forms, mass and energy, with something is 100% energy, it's form has no mass. That is not to say that it can not be converted to mass, on Earth, photosynthesis traps energy and the plant acquires mass. Both mass and energy are effected by gravity and mass can be thought of a a greater potential energy than radiation energy itself because it's energy is condensed in the form of mass.
The function of gravitation aligns both mass and energy, energy is the least effected but still is effected.
If you have to cut your lawn every week, you basically understand that sunlight is trapped by the process of photosynthesis and creates mass with addition to air and soil and water. A trapped photon adds to mass, whether it is trapped in a galaxy or a blade of grass.Drakkith said:A couple of things.
First, it's not that gravity affects mass and energy, it's that the presence of mass and energy warp spacetime and cause the effect we call gravity.
Second, saying that matter is viewed in two forms is misleading. There is no sliding scale from 100% mass/matter to 100% energy. Elementary particles have mass and when bound into atoms and molecules a system of particles loses some of that mass as energy, either in the form of radiation, kinetic energy, or heat. But this mass is only a property of the particles and the systems they occupy, it is not a "form" that they exist in. Electrons don't exist "as energy" sometimes and "as mass" at other times.
Third, I just want to make sure people understand that it isn't just that energy is converted to mass or vice versa, but also that when a quantity of energy leaves a system an equivalent amount of mass does so as well. Conversely, when energy enters a system, that system is now more massive. There doesn't have to be a conversion of what is known as rest mass into energy, though that can and does happen in chemical and nuclear reactions.
I'm not sure what this means. I'm guessing it has something to do with how gravity affects light? If so, remember that energy and light are NOT the same thing. 1 joule of energy carried by a warm object acts differently than 1 joule of energy carried by photons.
If you have to cut your lawn every week, you basically understand that sunlight is trapped by the process of photosynthesis and creates mass with addition to air and soil and water. A trapped photon adds to mass, whether it is trapped in a galaxy or a blade of grass.Drakkith said:A couple of things.
First, it's not that gravity affects mass and energy, it's that the presence of mass and energy warp spacetime and cause the effect we call gravity.
Second, saying that matter is viewed in two forms is misleading. There is no sliding scale from 100% mass/matter to 100% energy. Elementary particles have mass and when bound into atoms and molecules a system of particles loses some of that mass as energy, either in the form of radiation, kinetic energy, or heat. But this mass is only a property of the particles and the systems they occupy, it is not a "form" that they exist in. Electrons don't exist "as energy" sometimes and "as mass" at other times.
Third, I just want to make sure people understand that it isn't just that energy is converted to mass or vice versa, but also that when a quantity of energy leaves a system an equivalent amount of mass does so as well. Conversely, when energy enters a system, that system is now more massive. There doesn't have to be a conversion of what is known as rest mass into energy, though that can and does happen in chemical and nuclear reactions.
I'm not sure what this means. I'm guessing it has something to do with how gravity affects light? If so, remember that energy and light are NOT the same thing. 1 joule of energy carried by a warm object acts differently than 1 joule of energy carried by photons.
CharlesMichael said:If you have to cut your lawn every week, you basically understand that sunlight is trapped by the process of photosynthesis and creates mass with addition to air and soil and water. A trapped photon adds to mass, whether it is trapped in a galaxy or a blade of grass.
All forces required to maintaining equilibrium require an expenditure of energy period!
So stating that mass warps space time and the warpage of space time creates gravity is confusing because it seems to create a static field and a static process. That is a fundamental violation of forward time and space.
If space is finite and expanding it has to come from something to expand.
If on the other hand mass creates space-time ( the gravitational wave as a function of surface decay of mass, and since it is known that identical low energy waves generate from objects in a medium create combine into constructive interference waves and the resulting kickback brings the objects together, there is a better explanation. Mass gives off a gravitational wave creating space-time and the wave interaction creates the back action of gravitation.
If you have ever jumped on a trampoline, when two people jump together they create one large depression as they jump down and the result when they rebound back up is that they come together and collide. This is the fundamental way the force of gravity works, it is a back reaction to wavefront collision and reformation. This explains how gravity can act as a force and use up energy just as you can push a battery dead car but you also need to expend energy to do that.
All forces need to use energy up.
A black hole is a region of space where the gravitational pull is so strong that nothing, including light, can escape from it. This occurs when a massive star dies and collapses in on itself, creating a singularity.
A black hole has an incredibly strong gravitational pull due to its immense mass. This pull is so strong that even light, which has no mass, cannot escape from it. The light gets trapped in the black hole's event horizon, the point of no return.
The event horizon is the boundary around a black hole where the gravitational pull is so strong that nothing, including light, can escape. This is the point of no return, and once anything crosses the event horizon, it is pulled into the black hole.
No, a black hole cannot be seen directly since it absorbs all light that enters it. However, scientists can observe the effects of a black hole's presence, such as its gravitational pull on surrounding objects and the radiation emitted from its accretion disk.
The relationship between light and black holes is that light cannot escape a black hole's gravitational pull, thus making it appear as if the black hole is absorbing the light. However, some light can still escape from the accretion disk surrounding the black hole, making it possible for scientists to study and observe these objects.