 size 51 okay others it was zero you know it is one should I do it energy of the photon is what hc by lambda this is equal to the energy of the proton sorry counting edge of the proton let's that be e p okay fine so now energy of the photon is e so this is e only lambda 1 is deeply wavelength of proton so lambda 1 should be h by momentum which is what to mass of proton into e and in doubt now this is deeply wavelength of the proton and wavelength lambda 2 lambda 2 is what which is what see by e so from here you can get okay now lambda 1 divided by lambda 2 it will come out to be proportional to e to the power half right option 2 is correct okay it out all right so let's move to next one this we'll take a small break after this when you guys will be taking mock test which I've shared today how many will you take tomorrow so many okay let's see are you guys learn those who are taking mock test regularly are you guys learning anything new see we can do that we can do that okay so we have limited amount of time so I'm trying to optimize that suppose you have let's say 100 rupees so how you spend that same thing right so in case you have doubts where you have written a mock test we already spent three hours you know struggling with those questions you look at the solution you don't get few of them so there'll be I think hardly four or five questions like that you in which you have a doubt you can always post that on the group you already spent three hours with it and a class also goes in discussing those 30 questions that will be I think so to say a waste of some useful time which we can use to solve this past then I want to do this right so we need to optimize everything so that is another reason why I was planning to have life classes so that you know other best students also comes in then rather than doing same thing different places then we'll have only one class per week so if I have it online if it is just problem-solving then we can meet multiple times in a week we can do many many things otherwise just once in a week and there right now just couple of weeks are left anyways what is the answer for 52nd tell me frequency of a is it same as be see this stopping potential is same right that is a frequency of a will be able to frequency of B now stopping potential of C is more than A and B so frequency of C should be more okay frequency which is creating C stream will be more because finding a G maximum is more for C okay so look at option 1 frequency of a frequency of B that we have already and is not able to see so this is out of question this is out of question now between these two the only difference is in densities are same or different this is a different one photon per electron if you go by that logic then option one is correct okay fine so we'll take a small break and we'll meet after that