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

The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to wavelength of emitted radiation corresponds to the transition between

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

In the Bohr’s model of a hydrogen atom, the centripetal force is furnished by the Coulomb attraction between the proton and the electron. If a₀ is the radius of the ground state orbit, m is the mass and e is the charge on the electron, ε₀ is the vacuum permittivity, the speed of the electron is

When hydrogen atom is in its first excited level, its radius is

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?

When a hydrogen atom is raised from the ground state to an excited state

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? 

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