A single electron orbits around a stationary nucleus of charge +ze , where z is a constant and e is magnitude of electronic charge. It requires 47.2eV to exite the electron from $\;2^{nd}\;$ Bohr orbital to $\;3^{rd}\;$ Bohr orbital. find the atomic no.of element.The wavelength of radiation required remove electron from first Bohr's orbit to infinity is

Question

$(a)\;39.2 A^{0}\qquad(b)\;36.6 A^{0}\qquad(c)\;42.1 A^{0}\qquad(d)\;31.2 A^{0}$