Rajnish Mishra
Last Activity: 14 Years ago
If the light frequency is greater than a threshold frequency, fo, then a photoelectron will be ejected with kinetic energy up to a maximum value, K, according to the linear formula:
Photoelectric Equation is given by: K = hc/λ – W
(where W is the work function of the metal surface, h and c constants)
If the exciting wavelength is changed by ¾ X then the equation for Kmax will be:
Kmax1 = 4hc/3X – W
We can see that the Kmax1 (that is new max kinetic energy of an electron) is greater than Kmax. Hence the kinetic energy of the fastest emitted electron will be more than K.
Answer – 4.