Hydrogen atoms are excited from ground state to the principal quantum number 5. Number of spectral lines observed will be

Hydrogen atoms are excited from ground state of the principle quantum number 4 . Then the number of spectral lines observed will be

Hydrogen atoms are excited from ground state of the principle quantum number 4 . Then the number of spectral lines observed will be

Hydrogen atoms are excited from ground state to the state of priciple quantum number 4.Then the number of spectral lines observed will be

Hydrogen atom is excieted from ground state to another state with principal quantum number equal to 4

Hydrogen atom is excited from ground state to another state with principal quantum number equal to 5. Then the number of spectral lines in the emission spectra will be:

Hydrogen atom is excited from ground state to another state with principle quantum number equal to 4. Then the number of spectral lines in the emission spectra will be ......