Recent content by hschia

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...

What then, is the difference between the velocity,v and phase velocity, v[SIZE="1"]p in the lowest section? What is the physical implication behind these?

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?

What does this mathematical equation of proper time mean?

Thanks for the explanation!

Howdy! I'm new to Physics Forum and glad to be part of the community. 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...