Question

Cesium metal is frequently used in photoelectric cells because the amount of energy necessary to eject electrons from a cesium surface is relatively small-only 206.5 kJ/mol. Part A What wavelength of light (in nanometers) does this correspond to?

Answer 1

Answer:

Wavelength of light in (nm) = 579 nm

Explanation:

At first you find out the amount of energy needed to just eject one electron. This is given by $\frac{Energy}{Avogadro's number}$

this energy is given in question in kj/mole. This $\frac{Energy}{Avogadro's number}$ is the work function of cesium for each electron is equal to the planc'k  einstein equation.