Recent content by scissors

Ah, I see. Thanks a lot guys!

My problem is that I have the numbers...but I don't have a formula. "The sun's temp. is about 6000 K, it's radius 700000 km. How much power is it radiating? If there is no dissipation between here and the sun, how much of this hits the earth?" Is this the P = c/4*U thing?

I'm doing a lab report right now, but am fuzzy on uncertainty in certain respects. I have something like d = 25 +/-2, d2 = 330 +/- 3, x = 55 +/- 6etc how do I calculate the uncertainty, in another quantity, if it's like this c = (d1 + d2)/x Basically, how do I calculate the +/-...

But what equations do I have for En and Em?

So I have the equation 1/lambdamn = R(1/(n^2) - 1/(m^2)) Where m > n, and lambda is the energy emitted by a photon from m going down to n. And I have to get show that this formula can be explained by 1.) Requiring that light occurs in quanta 2.) And to get a formula for Energy in...

Oh, I see. But in that case, how do I calculate the required momentum, if I don't need a formula? Also, I have one other problem: 3.) Say we trap an electron in a 1-d box. What is it's lowest velocity if the box is 1mm, what if the box were atomic size? I'm using the uncertainty...

Do I use the formula hc/lambda >= Eeject once again? And I assume that Eeject = 1eV since it's one electron.

Disturb as in, momentum of the photon is greater than the momentum of the electron, therefore messing up the normal path of the electron. Thanks for your help on the others!

22 views and no reply? Somebody tell me if I'm on the right track! :cool:

I have the eqns, and have started out on these problems...but I'm not sure where to go at certain points. 1.) It takes 1.9 eV to free an electron from cesium. a.) Find the longest wavelength light which can free the electron. Well, we have the general equation from the...

Thanks a LOT! Haha, you are a lifesaver. I tried doing it some random way but I wasn't sure.

AH, thanks for the graphs, they were helpful, and made sense. I guess for the impedance, I am having trouble obtaining the equations to divide by.

Ah, thanks a lot! I have now Vc = -j/wC Ioe^jwt But how do I obtain an expression for V itself? Is that an eqn in terms of Vc and Vr?

Oh yeah, you were right about the time...I meant 10^-4. The scans are small for some reason, but here they are. [PLAIN]Questions[/URL] The graph is the first one, and the second two are for me to write in. Below is what I think it should be [PLAIN]Answer[/URL] The first...

Ah thanks. I haven't done much with impedance before, today will be the first lab of the semester, and I do have the equation Zc = -i / WC