If we assume that there is a fixed charged particle and another charged particle is spiraling down towards it, it emits electromagnetic waves as it is accelerated motion. We get a continuous spectrum. Now, if I allow the emitted photons to fall on a very photosensitive material, whose efficiency is known, then i can get photo electrons for those photons whose frequency is beyond threshold frequency. By knowing the current, i can know the number of electrons and from number of electrons, i can calculate the number of incident photons by dividing the number of electrons by efficiency. As photons have a unique frequency, i can determine the number of frequencies the photon can assume between the range in which it can make an electron come out. So this means that i am getting discrete values. But the spectrum is continuous everywhere. So, that's my question. Where am I making a mistake?