When a certain metal was irradiated with light of frequency 4×1016 s−1. The photoelectrons emitted had three times the kinetic energy as the kinetic energy of photoelectron emitted when the metal was irradiated with light of frequency2×1016 s−1. If the critical frequency of the metal (νo)=x×1016 s−1, then find the value of x.
(given, h=6.6×10−34 Js)
According to Einstein photoelectric equation,
Where, νo is the threshold frequency
According to the question,
Multiplying '3' in equation (2), we get
Subtracting equation (1) from equation (3) we get