which of the following electron transition will require the largest amount of energy in a hydrogen atom and how?
1)from n=1 to n=2
2)from n=2 to n=3
3)from n=infinity to n=1
4)from n=3 to n=5

The energy required to excite an electron of hydrogen atom from first orbit to 2nd orbit is and how?
1)3/4 of its ionisation energy
2)1/2 " " " " " " " " "
3)1/4 "
3)1/4 " " " " " " " "
4)none

A photon of energy 12.75eV is completely absorbed by a hydrogen atom initially in ground state.the principal quantum number of the excited state is and how?
1)1
2)3
3)4
4)infinite

as per bohr model,the minimum energy (in eV) required to excite the electron from the ground state of doubly ionised lithium(z=3) is and how?
1)1.51eV
2)13.6eV
3)91.8eV
4)122.4eV

as per bohr model,the minimum energy (in eV) required to excite the electron from the ground state of doubly ionised lithium(z=3) is and how?
1)1.51eV
2)13.6eV
3)91.8eV
4)122.4eV

The angular momentum of electron in an excited hydrogen atom is 2h/pie,the kinetic energy will be and how?
1) 13.6eV
2) 3.4eV
3) 0.85eV
4) 0.54eV