The long-wavelength (red) border of the photoelectric effect for silver is 26 μm. Determine the work function in joules.

The long-wavelength (red) border of the photoelectric effect for silver is 26 μm. Determine the work function in joules. Only with explanations is given, everything is as it should be.

To solve the problem, we will use the following formula:
Ab = h * c / l;
Thus, it turns out that Planck’s constant is 6.63 10 ^ -34 J / s, and the speed of light in a vacuum is 3 * 10 ^ 8 m / s.
Let’s substitute and calculate:
Ab = 6.63 10 ^ -34 * 3 * 10 ^ 8;
Av = 7.65 10 ^ -21 J;
Answer 7.65 10 ^ -21 J