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well prelim doesnt really have any direct impact upon your marks in hsc, but if you completely didnt get any of physics in prelim, u might be in trouble. if you dont really need the subject, and arent really doing well, its better to drop i think, or you may regret it (if u think u will regret...

hydrogen spectrum to bohrs model.. well the spectrum couldnt be described by the previous model, rutherfords, which only had electrons orbitting in the one orbit. if u look at balmer's and ryberg's (or whatever his name is') equation, you can see that they managed to predict the spectral...