Recent content by krugertown

A pulse 300ns long is made using a continuous wave laser and a very(very) fast shutter. What is (approx.) the minimum spectral width of the pulse? I have no idea where to start. For starters what is the spectral width? and how would i go about solving this problem. Not looking for a...

so something like \hat{x}-s^{2}\hat{y}?

By evaluating their dot product, find the values of the scalar s for which the two vectors b=\hat{x}+s\hat{y} and c=\hat{x}-s\hat{y} are orthogonal. I understand that for the two vecotrs to be perpindicular their dot product must be 0. however I am confused how to go about this problem...

Quantum! Particle in a box problem! HELP! An electron in a rigid box absorbs light. The longest wavelength in the absorbstion spectrum is 600nm. How long is the box? \lambda = c/f E=hf E= n2*((h2)/(8mL2)) so i figured out E from the wavelength to frequency formula and the E=hf. then i...

A 20cm x 20cm square loop of wire lies in the xy-plane with its bottom edge on the x-axis. The resistance of the loop is 0.50\Omega. A uniform magnetic field parallell to the z-axis is given by B=0.80y^{2}t, where B is in tesla, y in meters, and t in seconds. What is the size of the induced...

haha thanks! spent 45 minutes on that problem!

a 20cm long hollow nichrome tube of inner diameter 2.8mm, outer diameter 3.0mm is connected to a 3.0V battery. What is the current in the tube? I think this is a I = V/R problem. So i used R=(\rho*L)/A. Where L is the length of the wire and A is the outer area minus the inner area and rho...

so z becomes (-1/2)*(f(z)^(-3/2))*d/dz(f(z))? i understand that but how does that then become: E=(Q/(4pi*Epsilon naught)) (zQ/(z^2 + R^2)^3/2? thanks!

We found on-axis potential of a ring of radius R and Charge Q to be: V=(1/4pi*Epsilon naught) * (Q/sqrt(z^2 + R^2)) Find on axis electric field of ring of charge I know i just derive that equation, but am getting stuck. i got d/dz((1/4pi*Epsilon naught) * (Q/sqrt(z^2 + R^2)) Any...