Yes you're right, it was sloppy of me. :)
Thanks, I'm happy with this. So therefore:
1/10^15 = Constant * (Variation in T)
Variation in T = Some Number
So it's not a %, just +/- this number. Correct?
Sorry - The k is just a constant I put in, it's actually various quantities bundled together. So the dimensions do turn out to be correct. I just wanted to simplify and focus on the Q.
This is the key point and thanks for your answer. Could you perhaps expand on this? At the moment it just...
I think he wants you to justify why they behave like particles in a gas, before you write down the equations. Perhaps Wiki it? I think you need to explain the assumptions.
Hey, would you mind checking my thread? It's a basic numeracy one lol.
Isn't it something like: Assume the stars move about with a mean thermal energy, which is their KE. So KE = 1/2mv^2 = (3/2)KT
Then mv^2 = 3kT => T = mv^2/3k?
Hi,
Basically the question is about doppler shift. The formula is:
(f2 - f1)/f1 = -kT ; f1 = Freq in object rest frame, f2 = Freq in lab frame
The Q: Often, frequencies are compared to 1 part in 10^15. In order to make use of this level of accuracy, to what extent can T fluctuate?
I...
I gave you the details. It's a conceptual Q about whether an electron can absorb a photon. Apparently it violates conservation laws. The second bit is about a centrifuge 'overcoming' this issue. Nothing else is needed.
dEdT = h/2Pi
dE = (6.63 x 10^-34)/(2Pi * 10^-8) J
dE = [(6.63 x 10^-34)/(2Pi * 10^-8 * 1.6 x10^-19)] eV
dE = 6.6 x 10^-8 eV
dE = 7 x 10^-8 eV (1 Sig Fig)
The energy of the first excited state is 13.6/4 = 3.4 eV, so its energy uncertainty is tiny compared in comparison.
Hey,
It seems like this is impossible because momentum conservation is violated. I had a Q where an electron underwent an energy transition and emitted a photon, and then they asked whether it was possible for the photon to be reabsorbed by the electron to undergo the same transition as...
Hi,
I've been doing a Q where particles undergo circular/near-circular motion in an electric field. The electric field varies as 1/r. With the first particle, they set it off tangentially to the field lines, so it undergoes circular motion.
With the second particle, they set it off at a...
I've attached the paper in Q, please see Q 8.
Not sure what to do. Also confused about the fact it says 'calculate', when it depends on p and delta, so I don't see why I should get a numerical value. I don't know how to get an expression for N here, apart from a really messy and horrible...