If the electron revolving in the 3rd Bohr’s orbit of Hydrogen species has a radius is R. Then what will be its radius in the 4th orbit in terms of R? 1) (25/9)R 2) (16/9)R 3) (36/9)R 4) (9/16)R

Four objects of mass 1 kg are placed at the vertices of a square of side 2 m, an axis passing perpendicular to the plane of the square through one of the vertices then calculate the moment of inertia about ...