00:01
Now in this question, we look at a photo electron, right? so you have a meta, which has a work function according to the question, is four electron roads, right? and you ask to convert this work function to jors, well, you know, one electron volt is just 1 .6 times 10 to minus 19 jaw, right? so that's how you convert in the jors, it's 6 .4 times 10 to minus 19 jaw, right? so you have a light which has frequency.
00:36
So you have a photon, right, which is 1 .2 times 10 to 14 hertz.
00:44
Can this photon have enough energy to eject electron? so you can calculate the energy of course is a h.
00:50
Plank constant times if that is h according to the question's 6 .63, right? so it's given by 6 .63 times 10 to minus 34, actually, juror second times 1 .2 times 10 to 14, hertz, right? and then you found this result.
01:14
This is to be 6 .63 times 1 .2 times 10 to minus 20, right? and so, and actually this is basically less than this.
01:26
So this photon cannot eject electrons.
01:29
And how about another photon? if you have a different photon, has an increased frequency...