When an electron revolving in the ground state of a hydrogen atom jumps to its `2^"nd"` excited state.

The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is

The energy required to excite the electron from ground state of hydrogen atom to first excited state is

Calculate the de Broglies wavelength associated with the electron revolving in the first excited state of hydrogen atom. The ground state energy of the hydrogen atom is -13.6 eV.

The orbital velocity of the electron in the ground state of hydrogen atom is v. What will be its orbital velocity when excited to the energy state= -0.544 eV ?

The area of the electron orbit for the ground state of hydrogen atom is A.What will be the area of the electron orbit corresponding to the first excited state ?

In a hydrogen atom , If the energy of electron in the ground state is -x eV ., then that in the 2^(nd) excited state of He^(+) is