Question: What is the maximum wavelength of light that can cause the photoelectric effect in a metal with a work function of 2.0 eV?

Options:

1. 620 nm
2. 400 nm
3. 500 nm
4. 300 nm

Correct Answer: 620 nm

Solution:

The maximum wavelength λ_max can be calculated using λ_max = hc/E, where E = 2.0 eV = 3.2 x 10^-19 J. Thus, λ_max = (6.63 x 10^-34 * 3 x 10^8) / (3.2 x 10^-19) = 620 nm.