The electron in hydrogen atom jumps from `n_2= 5 to n_1, = 1`. Name the series in which the frequency emitted lies.

The electron in hydrogen atom jumps from n_2= 4 to n_1 = 2 . Name the series in which the frequency emitted lies.

(a) Using the Bohr's model calculate speed of electron in hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.

Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites form n to n-1 ,show that this frequency equals the classical frequency of revolution of the electron in the orbit.

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes trnsition from an energy level with n = 4 to an energy level with n = 2 ?

What is the wavelength of light emitted when the electron in hydrogen atom undergoes transition from an energy level with n = 6 to an energy level with n = 3 ?