Recent content by kashiark

Homework Statement Rotate the area bound by the following lines around the x-axis. y = x^2+1, y = -x^2+2x+5, x = 0, x = 3 Homework Equations None that are uniform enough to put here considering I'm fairly sure it's not washer... The Attempt at a Solution

I don't understand the green house effect. According to wikipedia, the green house effect is the result of non-directional re-emission of thermal radiation after being reflected from the ground from water vapor, methane, carbon dioxide etc., but shouldn't it cancel itself out? Shouldn't just as...

That's simple enough; I was just confused over the terminology; thanks!

The two are equivalent; so the lasing energy levels are just the levels that the electrons jump to release the photon?

I know how to find the energy of the given wavelength, but how do I find the other lasing energy level? What is a lasing energy anyway, and why are there 2?

Homework Statement How can you know "the difference between the two lasing energy levels?" Homework Equations n(lambda) = 2(pi)r E = hf mvr = n(h-bar) The Attempt at a Solution no clue

Nevermind; I had a problem, but I figured it out. Thanks everyone!

Ok, one more question and then I'm done. F = q(E + v cross B) Can someone do one of these as an example? Thanks!

So if an electron were stationary in space, it would have an extremely weak north side and a south pole on two sides opposite one another?

Thanks! You've cleared up many of my misconceptions, but I don't understand your last statement. "The magnetic dipole moment due to spin kind of cancels itself out since it has two opposite fields close together, or so it would seem." Do you mean when the electrons are in pairs or will just one...

Isn't the magnetic moment of an electron (and positron for that matter) dependent on the spin? And isn't the magnetic field dependent on the magnetic moment?

Ok, let's say we have a positron and an electron moving toward one another; which way would the magnetic field point? Does it depend on their spins? If so, what if they have the same spin?

So how would you calculate the force at any point in time assuming you knew the distance at that particular point?

If an electric field causes 2 previously stationary charges to accelerate(let's say that there was something inhibiting their movement that has now been removed) toward or away from one another, what type of field is between them, electric or magnetic?

How did particles exist in the very, very early universe when its diameter was smaller than their wavelengths? Are we just supposed to be content with the supposition that wave descriptions are impractical in this situation?