
framework of STR, interesting problems
One of the things I never fully grasped in college was the ‘Michelson Morley’ experiment. I understood what it was for (proving the constancy of the speed of light) – and understood that it proved that very well – but … Continue reading
Imagine you are in a spaceship moving away from the earth at a velocity v. Imagine that a TV broadcast is sent to your spaceship from Earth. How would you see the broadcast?
Some mathematical preliminaries will help figure out … Continue reading
Light has no mass – yet it can push solar sails. How?
It is true that photons do not have “rest” mass. They do have energy – and hence an associated mass given by m = E/c2. Light has momentum … Continue reading