Answer:
Clearly, \[{{\lambda }_{0}}=3400\overset{\circ }{\mathop{\text{A}}}\,\] is the threshold wavelength for nickel plate. When \[\lambda \le {{\lambda }_{0}},\]the incident photons have energy more than or equal to work function of Ni, so photoelectric emission occurs. When\[\lambda >{{\lambda }_{0}}\] energy of photons is less than the work function, so photo electric emission does not occur.
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