Photoelectric Module Question #31

[Uyenvy Nguyen 1D]

Hey guys. How would I solve this?

If 3.607 x 10^-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this?
A. 802.0 nm

B. 163.2 nm

C. 550.7 nm

D. 181.6 nm

E. None of the above

I was able to solve for the frequency, but I'm not sure which formula I could use to find the wavelength.

[SainehaMaddineni_3I]

To find wavelength, you can use the c = λv equation and solve for λ (wavelength). Plug in the frequency you found as v and use 3.00*10^8 m*s^-1 as your c (speed of light).

[Uyenvy Nguyen 1D]

thank you! i completely forgot speed of light was a constant!