A light beam is shining on a metal target that has a work function of 2.20 eV.If a stopping potential of 1.30 V is required,what is the wavelength of the incoming monochromatic light? (h = 6.63 x 10^-34 J*s,c = 3.00 x 10⁸ m/s,1 eV = 1.60 x 10^-19 J,and 1 nm = 10^-9 m) A)355 nm B)497 nm C)744 nm D)1 421 nm

Question

Quizplus · Accepted Answer

The energy of the incoming light is the sum of the work function and the stopping potential energy. Convert the work function and stopping potential to joules, then use E = hf = hc/λ to find the wavelength.

A Light Beam Is Shining on a Metal Target That