Recent content by ri0t

I'm going to go ahead and assume the formula in which you speak is lambda = h/mc(1-Costheta), but it doesn't make any sense because you can't get energy from it. That's where I'm lost.

Homework Statement An x-ray photon of wavelength 0.025 nm collides elastically with an electron and scatters through an angle of 90 degrees. How much energy did the electron acquire in this collision and in what way did the x-ray change? Homework Equations E=pc E=hc/lambda The Attempt...

Thanks much.

I think I've figured out the problem using v=fλ, 3.0e8 = 5.98e14λ, λ=5.02e-7m. Also the answer to your question is that as frequency increases, wavelength decreases. Would be awesome if you could tell me I'm on the right track, and of course if I'm not, as well.

Homework Statement Barium has a work function of 2.48 eV. What is the longest wavelength of light that will cause electrons to be emitted from barium? Homework Equations W = hf○ hf = W + Ek E = hf = hc/λ The Attempt at a Solution 1 eV/1.6e-19 C = 2.48/X X = 3.97e-19 W=hf○...