The ground state energy of H-atom is 13.6 eV. The energy needed to ionize H –atom from its second excited state is 

The spectrum obtained from a sodium vapour lamp is an example of

The ionization energy  of hydrogen atom is 13.6 eV.  Following Bohr’s theory, the energy corresponding to a transition between 3^rd and 4^th orbit is

Which of the following  transitions in a hydrogen atom emits off the highest frequency? 

Hydrogen atom emits blue light when it changes from n = 4 energy level to n = 2 level. Which colour of light would the atom emit when it changes from n = 5 level to n = 2 level?

If the electron in a hydrogen atom jumps from an orbit with level n₂ = 3 to an orbit with level n₁ = 2, the emitted radiation has a wavelength given by 

The energy required to excite hydrogen atom from n = 1 to n = 2 state is 10.2 eV. What is the wavelength emitted  when it returns to ground state? 

When electron jumps from n = 4 to n = 2 orbit, we get

In the Bohr model of the hydrogen atom, let R, V and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively.Which of the following quantity is proportional to the quantum number n?

The Bohr model of atoms