When a certain metal was irradiated with light of frequency 4.5 x 10 16 s -1 , the photo electrons emitted had 3 times the kinetic energy as the kinetic energy of photo electrons emitted when same metal was irradiated with light of frequency 2.5 x 10 16 s -1 . Calculate threshold frequency of the metal.
When a certain metal was irradiated with light of frequency 4.5 x 10
16
s
-1
, the photo electrons emitted
had 3 times the kinetic energy as the kinetic energy of photo electrons emitted when same metal was
irradiated with light of frequency 2.5 x 10
16
s
-1
. Calculate threshold frequency of the metal.