Speed of Light and Protons
If the definition of the speed of light is for massless particles, then how is a proton, having mass, accelerated to the speed of light? This sounds like a conumdrum.
Posted Thierence
Answer:
No massive particle has not so far crossed the speed of light. Even the extremely light particles – the neutrinos – couldnot cross the speed of light. Protons have not crossed the speed of light. When it nears the speed of light, the relativistic mechanics will become prominent and the it is to be treated is different from the classical mechanics.
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Categories: Ask Physics, CBSE PHYSICS CLASS XI, Interesting Questions, Relativity Tags: Alternative, black hole, Classical mechanics, Internet forum, physics, relativity, Special relativity, wikipedia
Black Holes and Space
Is it possible that matter falling into a black hole would emerge in some form of elementary particles or energy in some other point in space or even time (space/time)?
I thought that matter couldn’t be destroyed just transformed into energy or some other form of matter.
Articles or theories on what happens to matter falling into a black hole say that it just falls out of existence. That doesn’t make sense.
(Posted by Victor )
Simulated gravitational lensing (black hole going past a background galaxy). (Photo credit: Wikipedia)
Responses:
“I have few knowledge about this subject, even though I think that ordinary matter when enters into blackholes may convert into darkmatter, ie energy associated with ordinary matter escapes & the matter will convert into darkmatter. From the origin of our universe this process may take place & this may be the reason that the amount of darkmatter is greater than that of ordinary matter.Here matter is not destroyed because total matter(including dark matter & visible matter ) remains constant.” … Anitha Anand (Student at university college,TVM)
Categories: Ask Physics, Interesting Questions, Relativity Tags: Accretion disc, black hole, Einstein ring, Elementary particle, Gravitational lens, Hubble Space Telescope, Large Magellanic Cloud, Massachusetts Institute of Technology, matter, physics, Relativistic jet, relativity, Schwarzschild radius, wikipedia
Time Dilation problem – Special Relativity
With what speed will a clock have to be moving in order to run at a rate that is one half the rate of a clock at rest?
Posted by Mona
Answer:
Using the formula for Relativistic Time (according to Special Theory of Relativity)
√[1 - (v²/c²)] = ½ → v² = (3/4)c²
v = [√3/2]*c = .866c
Categories: Ask Physics, CBSE PHYSICS CLASS XI, IIT JEE, Interesting Questions, KINEMATICS, Problems, Relativity Tags: Albert Einstein, Cornell University, Mass–energy equivalence, PLoS, Pupil, Ritch Savin-Williams, Sexual orientation, theory of relativity
Question from Special Relativity
A spacecraft starts from earth moving at constant speed to planet A which is 20 light-hour away from Earth.
It takes 25 hour (according to an earth observer) for a spacecraft to reach this planet. Assuming that clocks are synchronized at the beginning of the journey, compare the time elapsed in the spacecraft frame for this one-way journey with the time elapsed as measured by an earth-based clock?
Posted by Mona
Categories: Ask Physics, AstroPhysics, IIT JEE, Interesting Questions, Numerical Problems, Problems, Relativity Tags: earth, Jet Propulsion Laboratory, Jupiter, mars, NASA, Spacecraft, Voyager 1, Voyager program
