Photoelectric effect problem from review session

[Nicole Coulter]

Hi, I was trying to work out the problem from the review session today, we are given 430 nm and work function equal to 2.71 eV. I was working out the problem to make sure I could do it on my own, but I keep getting 2.4*10^5 instead of the 10^6 but cannot find anywhere where I went wrong, someone please help!

[Nicholas Ryan 2K]

Use the given wavelength to calculate the frequency of the photons by using the formula v = c/λ. Use the frequency v to calculate the energy by mutiplying it with Planck's constant h, so: E = hv Then convert the work function into joules. Lastly, subtract the converted work function from the electron energy.