Recent content by roz77

Here's the problem. I have a function generator that's outputting a sine wave, and that shows up fine on the scope. I hook up the sync output of the function generator to the external trigger of the scope, then hit the button for infinite persistence, and nothing seems to happen.

What exactly do you mean by persistence mode? I know I can turn on infinite persistence, but I'm not sure 1) what this means and 2) if it's the same things as persistence mode.

I'm working on some stuff using an oscilloscope, and I need to figure out how to obtain an eye diagram, or eye pattern on it. Right now I just have a function generator hooked up to it. There's a sync output on the function generator as well as the output for the signal. Do I just hook up the...

Hey all. I'm currently working on a project where I use a laser to transmit music playing from my iPod. The laser is hooked up to the iPod through a circuit, and there is a solar cell that the laser is pointed at. There are two wires coming from the solar cell that are connected to a stereo...

Duh. Magnitude is 1. Nevermind.

So would the magnitude of the reflected wave just be B+C?

See, I do get that. Clearly the entire wave eventually is reflected back because of the infinite barrier. However, it asks for the magnitude of the wave propagating to the left, and I took that to mean the wave that is reflected when it hits the step at z=-b. I also have to solve for C, so if...

So what would the faster way to do it be?

Homework Statement We have a potential structure as follows: from z=negative infinity to z=-b, the potential is 0. At z=-b, the potential jumps up to some V_0. Then, at z=0, there is a potential barrier of infinite height. I need to solve for the magnitude of the reflected wave (i.e. the wave...

k and z are just random variables that were in the problem. I know that when its exp[ikz], the angle is kz, but I'm not sure when it's iexp[ikz].

I have two complex numbers, let's call them A and B. A=2exp[-ikz], and B=2iexp[-ikz]. I have to figure out the angle of these two numbers, and I am just completely drawing a blank on B. I know that the angle of A is just -kz, but I can't remember how to figure it out for part B. I can't remember...

Thanks. That worked perfectly. I actually have another question now. I need to find a Taylor series for x^(1/2) about a general center c=a^2. I've been taking derivatives and trying to find a pattern. I seem to be on the verge of it but I just can quite get it. Anyone know what the formula...

So I know how to take the general derivative of this equation. It's a simple product rule. I have that. My problem is, I need to show that the derivative at x=0 is 0. I know that I'm supposed to use this equation. f'(x)= lim x->0 of [f(x+h)-f(x)]/h So I plug in x+h and I get...

There is a spaceship in low-earth orbit, at 2000km above the surface of the earth. There are two balls in the spaceship that are dropped. The balls are 1m apart. How long will it take for their separation to increase to 1.01m? Assume that one ball is at 2000km, and the other is at 2000km+1m...

So this is a problem my friend was doing. I don't remember the specific values for the variables, but it should be ok. There is a speck of dust floating above an infinite plane. The speck of dust has a charge q1. The plane has a charge density of sigma= xC/m^2. What is the mass of the speck of...