No. I understand the difference between PHASE and GROUP velocities, but find it difficult to visualise the difference between PHASE velocity and ''PURELY'' velocity. The following is an equation copied from the wikipedia link:
Using relativistic relations for energy and momentum, we have...
In quantum mechanics, what is the difference between velocity and phase velocity of matter wave? How can it also be that phase velocity of matter wave always exceeds the speed of light?
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I just finished reading Einstein's Special Theory of Relativity and cannot understand the term 'proper time'. What does it specifically mean? When deriving the equation for length contraction, the author of Giancoli Sixth...