# Category - Physics

Quantum theory, relativity, general physics, applications, fun stuff.

What exactly IS a DIFFERENTIAL EQUATION and how does it arise in the first place? Most physics courses start by taking the equation as a GIVEN – not bothering to explain how it comes about in the first place. And then, you...

Relativity applies to all branches of physics. However, it is more of a geometrical framework – on which the laws of physics can be described. Calling relativity physics would be like calling Euclidean Geometry...

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 I...

Probably the most startling revelation of Quantum Theory was the postulate that all particles have a waviness to them. Initially, when this was proposed for photons, physicist were more open to accepting it – since light was...

Quantum Mechanics starting point – The Schrodinger Equation (1) All laws of physics are required to be Lorentz Invariant . The above equation is not. To try and make it Lorentz invariant, we start with looking...

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? The Approach to the solution We imagine that observers...

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 given by p...

If you threw an egg at your bedsheet or blanket (held from all 4 ends), would it break? The answer is no. Newton said that the force that the egg would experience, would depend on the ‘rapidity’ with which it came to a...