Work function of metal A is equal to the ionisation energy of hydrogen atom in first excited state. Work function of metal B is equal to the ionisation energy of He+ion in second orbit. Photons of same energy E are incident on both A and B. Maximum kinetic energy of photoelectrons from A is twice that of photoelectrons emitted from B.
Value of E (in eV) is
(a) 20.8
(b) 32.2
(c) 24.6
(d) 23.8
