6.2 Exercise 2

Cut-off frequency for the photoelectric effect in some materials is $8.0 \times 10^{13} \text{Hz} .$ When the incident light has a frequency of $1.2 \times 10^{14} \text{Hz} ,$ the stopping potential is measured as – 0.16 V. Estimate a value of Planck’s constant from these data (in units $\text{J} \cdot \text{s}$ and $\text{eV} \cdot \text{s}$) and determine the percentage error of your estimation.