Propagation of Light, Group velocity and Phase velocity
Prasanna asks: “how can light travel in the form of waves in space, which has no medium? if light doesn’t travel in the form of wave in the space then in equation. ‘phase velocity=c^2/group velocity ‘...
View ArticleAn interesting question based on Relativity (Time dilation and the Twin Paradox)
Yes, this is similar to the twin paradox, but with a few changes: Two brothers set off from earth to make a round trip of 30 light years in total. The first brother, say Albert, has a ship that travels...
View ArticleInertia and Higgs Boson
what causes inertia, and where is inertial energy stored? If it is related to a 3 dimensional particle, such as a boson, then why does the inertial g force subside after an object has reached a steady...
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Relativity and shape of objects
A triangular shape spacecraft flies by an observer at 0.95c. When the ship is measured by an observer at rest with respect to the ship, the distances x and y are found to be 50m and 25m respectively....
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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....
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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...
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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...
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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...
View ArticleRelativity?
Charan asked: Suppose that you are a person 1 standing on a planet.You could see a person 2 moving in a space craft.2 has a mirror(on the surface of planet) exactly at is down which is moving exactly...
View ArticleSpeed of Light – a thought experiment
Suppose that you are a person 1 standing on a planet.You could see a person 2 moving in a space craft.2 has a mirror(on the surface of planet) exactly at is down which is moving exactly with the same...
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