What is the maximum speed of the emitted photoelectrons as they leave the cathode?
4.5×105 m s−14.5 \times 10^5 \text{ m s}^{-1}4.5×105 m s−1
6.4×105 m s−16.4 \times 10^5 \text{ m s}^{-1}6.4×105 m s−1
8.2×105 m s−18.2 \times 10^5 \text{ m s}^{-1}8.2×105 m s−1
1.4×106 m s−11.4 \times 10^6 \text{ m s}^{-1}1.4×106 m s−1
