What is the longets wavelength photon that can ionize a hydrogen atom in its ground state? Specify the radiation type.

The hydrogen atom is said to be in its ground state when the orbital electron

The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. The KE of this electron is:

What is the kineitc energy of the electron in the 2nd excited state of hydrogen atom?

The ionisation energy of hydrogen atom is 13.6 eV. The hydrogen atom in the ground state is excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory the number of spectral lines emitted are