The photoelectric threshold wavelength of silver is 3250 × 10–10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10–10 m is
(Given h = 4.14 × 10–15 eVs and c = 3 × 108 ms–1)
1
≈ 0.3 × 106 ms–1
2
≈ 0.6 × 105 ms–1
3
≈ 0.6 × 106 ms–1
4
≈ 61 × 103 ms–1