Table 2. Kinetic energy determination for photoelectrons light colour light cut-off Maximum Ex of ejected light wavelength, A voltage, V. electrons frequency, f (nm) (V) E (eV) E(J) (Hz) yellow 578 green 546 blue 480 violet 410Observation Chart Colour Yellow Green Blue Violet Wavelength 578 nm 546 nm 480 nm 410 nm 410 nm low- high- intensity intensity Retarding Photo- Photo- Photo- Photo- Photo- potential current current current current current (V) (HA) (HA) (HA) (HA) (HA) 0.00 3.2 10.4 11.2 8.5 14.8 0.05 2.3 8.7 10.1 8.1 14.0 0.10 1.3 7.1 9.0 7.6 13.3 0.15 0.6 5.5 8.0 7.2 12.6 0.20 0.2 4.0 7.0 6.7 11.9 0.25 0 2.4 6.0 6.2 11.1 0.30 1.0 4.9 5.7 10.4 0.35 0.2 3.8 5.3 9.6 0.40 0 2.8 4.8 8.9 0.45 0 1.7 4.4 8.2 0.50 1.2 3.9 7.0 0.55 0.7 3.4 6.7 0.60 0.4 3.0 6.0 0.65 0.1 2.5 5.2 0.70 0 2.0 4.5 0.75 0 1.6 3.7 0.80 1.1 3.0 0.85 0.9 2.3 0.90 0.7 1.7 0.95 0.5 1.2 1.00 0.3 0.8 1.05 0.2 0.4 1.10 0.1 0.1 1.15 0 1.20 0