If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:
12ke2r
−ke2r
mke2r
ke2r
Solution:
Total energy=K.E.+P.E. K.E.=½mv²=12ke2r (cenrtipetal force) P.E. = −ke2r T.E.=12ke2r+−ke2r=−12ke2r Hence, option B is correct.