What is the maximum speed of the emitted photoelectrons?
(Take the mass of an electron, me=9.11×10−31 kgm_e = 9.11 \times 10^{-31} \text{ kg}me=9.11×10−31 kg)
5.3×105 m s−15.3 \times 10^5 \text{ m s}^{-1}5.3×105 m s−1
7.6×105 m s−17.6 \times 10^5 \text{ m s}^{-1}7.6×105 m s−1
1.2×106 m s−11.2 \times 10^6 \text{ m s}^{-1}1.2×106 m s−1
1.5×106 m s−11.5 \times 10^6 \text{ m s}^{-1}1.5×106 m s−1