we know
E = E0 + K.E
E0 = threshold energy
K.E is kinetic energy
hν = hν0 + K.E
1.
minimum energy needed to eject electrons from a metal =
hν0 = 6.625 * 10-34 J.s * 4.55 *
1014.s-1
                                                                                                                Â
= 30.14375 * 10-20J
2.
K.E = hν - hν0
     = hc / Λ -
(30.14375 * 10-20J)
     = [(6.625 * 10-34J.s *
3*108m/s) / 265 * 10-9m] - (30.14375 *
10-20J)
     = 44.857 * 10-20 J
   Â
