Recent content by nick227

Homework Statement What energy (in eV) should a beam of electrons have so that 0.1% of them are able to tunnel through a barrier of height 7.0eV and 1.0 nm wide? Start with the equation for T(E) and set it up with 1/T(E) on one side and let E/U=x for the unknown. Solve the equation for x and...

Well seeing as how I am moving away from the source wouldn't it be a red shift, so 700nm. But everything i read about red shift is if the source is moving away from the observer. now assuming that doesn't matter, am i right? finding v=c(f_o^2 - f_s^2)/(f_s^2 + f_o^2) f_o = f of observer f_s...

Homework Statement A spaceship moves radially away from the Earth with an acceleration of 20m/c2. How long does it take the sodium street lamps (\lambda=589 nm) on Earth to be invisible (with a powerful telescope) to the human eye of the astronauts? The visible spectrum is 400-700nm...

wouldn't the magnetic be the same as the electric field, just opposite in direction. because if you want the electron to have no deflection, the B-field and E-field have to be the same in different direction (i think). so using that theory (its probably wrong), the magnetic field is 100 and it...

are you thinking of the lorentz law? f=qE+qv X B? though, coulomb's law also comes into mind. i was looking through my book and found this equation: e/me = V(theta)/(B2ld) this was in the chapter where the question came from, in the section where the question came from... but how does this...

you are on the millenium falcon, going at the speed of light, and you fire a laser. does the laser go anywhere? if you were on a truck moving at 50m/s and threw a ball forward at 20m/s, then the ball would go at 70m/s. not the same when dealing with c, right? so then how can the laser go...

Homework Statement A muon is captured by a deuteron to form a muonic atom. Find the energy of the ground state and the first excited state. find the wavelength when the transition occursHomework Equations E_{n} = \frac{-13.6Z^{2}}{n^{2}} \frac{1}{\lambda} =...

Homework Statement A 10keV electron moving horizontally enters a region of space in which there is directed downward an electric field of magnitude 100V/cm. (a) what are the magnitude and direction of the smallest magnetic field that will allow the electron to continue to move horizontally...

1/\lambda = R(1/nf2-1/ni2)? so if i try 3 and 6, i get 1.093*10^-6. this is it, right? thanks so much.

Homework Statement A line of wavelength \lambda = 1091nm is observed in the hydrogen spectrum. Identify the transition that leads to this line. Homework Equations I don't know what this is asking... The Attempt at a Solution

Hey all. I am working on this program that will light LEDs from the parallel port of my computer. I think i have everything all set, but i want to do something cool. I was thinking of alternating lights between three colors. i am new to VB (and programming in general) and was wondering if there...

so... 1.723=2a a=.8615 t=(.8615)^(3/2)=.800yr .800*365 = 292 days 292 is the answer. thanks a lot.

Homework Statement I have this problem for homework and I don't know how to even start. Can someone help? Thanks in advance.A neat and exploitive use of the sun would be to put a space probe into a solar elliptical orbit from the Earth on one side of the sun headed towards a rendezvous with...

Homework Statement A cup of coffee is dropped aboard an airplane accelerating along a smooth runway. If it falls a vertical distance of 1.0 meter, find its horizontal displacement when it hits the floor. Assume a constant horizontal acceleration of 1.5m/s^2 for the airplane. Homework...

Homework Statement For the following force, determine whether it is conservative or not. Homework Equations F=i(5abx^2+2ab^2y^5)+j(7abz^2+a^2b^3y)+k(18abz^3) i, j, k being unit vectors and a and b are constants The Attempt at a Solution I found the curl to be...