Recent content by Aerozeppelin

There must be a solution as it was on an exam?

This is all the information given!

Homework Statement A beam of wavelength 600 nm has initially an intensity profile of Gaussian shape with a fwhm of 1 mm. Determine the intensity profile and fwhm 10 meter away.Homework Equations FWHM = λ/(2NA√(1 + I/Is)) The Attempt at a Solution [/B] FWHM1 = 1mm = 600 nm/(2NA√(1 + I/Is))...

Ok, I'm finding the whole spatial quantisation concept pretty difficult to grasp. Thanks for all your help. Sorry for the poorly phrased questions!

Lz = m \hbar This means that the angular momentum is quantized right? Would a magnetic/electric field alter this relationship?

I totally understand it now, great explanation!

Where l is the azimuthal quantum number!

Yes, because it is continuous with respect to the variable, and its derivate. So, would you suggest differentiating the wave function and letting the derivative equal the original wavefunction? I tried this and got: ml = \frac{1}{i} But I don't see how this shows that ml can only...

Homework Statement Applly conditions to azimuthal wave function for an electron in the hydrogen atom to show that ml, the magnetic quantum number, can take on any integer value. See attachment for actual question. Homework Equations I'm pretty stuck, is it something to do with the...

I'm a 2nd year applied physics student in university and I'm wondering if anyone has advice on careers in atmospheric physics / geophysics. Although it is controversial I would like to go into the field of research of climate control by injecting volcanic ash into the atmosphere. Does...

Does changing the amplitude or width of these pulses do anything? I'm trying to figure out how to increase a motors speed! Thanks in advance!

Thanks for the reply :smile: Would I be correct in saying that both the field and the armature vary from shunt, series and compound? Or would it be the field just changing with respect to the armature? :bugeye:

a. the commutator b. the brushes c. the field d. the armature I know this is a basic question, its off an old exam paper I am looking at. I think its the brushes because if it doesn't have brushes, then its a brushless dc motor, which isn't basic right? Thanks for your help! :shy:

Can't believe I didn't think of that! Thanks a million. Here's my answer if anyone wants it. σ=\frac{1}{ρ} 1.053x10-3 = q (nμn + pμp) Where: q is the charge of an electron. μn is the mobility of electron. = 0.12 And μp is the mobility of holes. = 0.04 To solve for...

Homework Statement If a sample of pure silicon at 300 Kelvin has a resistivity of 950Ωm, and if the electron-to-hole mobility ration is 3:1, with the electron mobility equal to 0.12m2V-1s-1, what are the intrinsic hole and electron concentrations? Homework Equations I know resistivity...