Recent content by weezy

So I've been looking at a few material tests and they all start with a rectangular sample of the material, loaded into a machine which extends them by increasing load at a constant rate and measures the strain/stress till the point of material fracture. The yield stress is measured in usually...

This is a basic assumption that's made during the derivation of results of special theory of relativity is that space is homogeneous i.e. space intervals shouldn't be given preference based on our choice of origin. However I want to understand more about this assumption and its importance...

Why is the absorption emitting explanation wrong? How do you explain refraction at photon level then?

I can say for sure that an infinite sum of 0s will always be 0. Not sure about the rest.

If you search for "does a photon experience time", almost every other link says that they travel at the speed of light and so STR tells us that its clock doesn't tick at all. However why do they use the arguments for special relativity which was developed for massive particles moving close to...

Homework Statement ## \psi(x) = N. (x^2 - l^2)^2 ## for ##|x| < l , 0 ## otherwise We have to find N such that this wavefunction is normalised.2. The attempt at a solution I tried expanding the ## (x^2 - l^2)^2 ## term inside the integral but this integral is extremely messy : ##...

Original Quora link : https://www.quora.com/If-the-universe-is-infinite-could-there-be-another-me

This question on quora discusses whether an infinite universe would allow for a repetition of patterns and arrangements of matter. The top answer gives a very convincing argument as to why this would be impossible because, he reasons, that spacetime is causally connected. However if the universe...

Would really recommend to develop an intuitive understanding of probabilities and probability amplitudes. Feynaman's lectures Vol 3 chapter one and two deal with this in great detail. Also Physics videos by Eugene khutoryansky on youtube will help you understand a lot of basic quantum topics...

This link shows us how to derive Hamilton's generalised principle starting from D'Alembert's principle. While I had no trouble understanding the derivation I am stuck on this particular step. I can't justify why ## \frac{d}{dt} \delta r_i = \delta [\frac{d}{dt}r_i] ##. This is because if I...

is it correct to say that just after the photon is ejected from our source, the wavefunction, which may have a speed greater than the speed of light ** or have no speed at all and is present at all points in space, from the moment the photon was released, has already interfered at the detector...

I think you meant that the act of "splitting" the probability wave by the two slits cannot be regarded as simultaneous.

But the emission started out as a one photon given by one state vector at the laser source.

The confusion I think comes from introducing the idea of photon self-interference in the first place.

I know it is not wise to consider the probability waves as something analogous to a real wave propagating through space but most quantum mechanics books address the double slit experiment through this way. As for the QED explanation I'm not there yet to fully understand it.