Recent content by ppyadof

You are correct that from the point of view of an outside observer they would see material approaching the event horizon but would not see it 'fall in' as such. Imagine two observers, Alice and Bob. Suppose that Alice falls into the black hole and Bob is stationary at infinity with respect to...

Post the working that you've done so far. You need to show attempt of some kind first.

Unless I made a mistake, you should end up with something like: |\psi|^2 = |a_0 \psi_0|^2 + |a_1 \psi_1|^2 + a_0a^{*}_1\psi_0\psi^{*}_1 + a_1a^{*}_0\psi_1\psi^{*}_0 Obviously the normalisation constants of the first two terms of that expression are going to be real. You can prove that by...

Have you tried working out any partial derivatives of your hamiltonian?

oh yeah, my bad.

This is just an educated guess, but I'd say something like: \psi = a_0 \psi_0 + a_1 \psi_1 So: \int \psi \psi^{*} d^3r = \int (a_0 \psi_0 + a_1 \psi_1)(a^{*}_0 \psi^{*}_0 + a^{*}_1 \psi^{*}_1) d^3r Now all you need to do is expand the RHS and see what you get (the integral is over all space...

What exactly does a Bose-Einstein Condensate look like with the naked eye? Is there any special about what it looks like through the optical part of the spectrum? What are the electromagnetic properties of a BEC as a whole?

I'm confused about the terminator obeying the laws of physics, since a major part of the story is to do with time travel, and as far as I know that hasn't even been shown to be possible, even in principle.

Homework Statement This is the first question from a past exam paper I'm doing at the moment, and I'm not sure if it's a case that I'm doing something stupid, or if there is a problem with the question. Q: The wavefunction of a deuteron can be approximated by: \psi (r) = \frac{C}{r}...

Homework Statement a) Using the Robertson-Walker metric, write down an expression for the proper distance in terms of the coordinate r. For objects moving with the expansion of the universe, show that the proper distance increases with time in the manner described by the Hubble Law. b) Use...

I seriously doubt that ion cannons could be made into a superweapon, because if you think about what it actually is, all it is is a stream of ionized atoms, and so will have very little destructive power (mainly because of the atmosphere), and what's more, if the weapon was fired from space...

That's ok. Only too glad to help. Steep learning curves are the best in the long run, take my word for it :P

V = \pi \int y^2 dx Just let y^2 = r^2 - x^2 where r is a constant, and then its just a case of picking the limits of the integral to suit the problem. The integral itself shouldn't present any problems.

lol. I assume that you meant to post something, just never got round to it :P

I said that I wasn't sure about it - Thats my disclaimer :P