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Special Theory of Relativity
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framework of STR, interesting problems

On the Ether | Posted on by Anuj Varma

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


Watching Television while moving Relativistically | Posted on by Anuj Varma

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


Solar sails – How do they work? | Posted on by Anuj Varma

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