An imaginary particle has a charge equal to that of an electron and mass 100 times the mass of the electron. It moves in a circular orbit around a nucleus of charge +4e . Take the mass of the nucleus to be infinite. Assuming that the Bohr model is applicable to this system.
(a) Derive an expression for the radius of n th Bohr orbit.
(b) Find the wavelength of the radiation emitted when the particle jumps from fourth orbit to the second orbit.