When light of wavelength 248 nm falls on a metal of threshold energy 3.0 eV, the de-Broglie wavelength of emitted electrons is ...... Å. (Round off to the Nearest Integer). [Use : 3 = 1.73, h = 6.63 × 10–34 Js me = 9.1 × 10–31 kg ; c = 3.0 × 108 ms–1 ; 1eV = 1.6 × 10–19J
