Using Bohr's porstulates of atomic model, derive the expression for the radius of the `n^(th)` orbit.

Using Bohr's postulates of the atomic model, derive the expression for radius of n-th electron orbit. Hence obtain the expression for Bohr's radius.

State two postulates of Bohr atom model

Define orbital speed. Derive the expression for it.

Using Bohr's postulates, derive the expression for the frequency of radiation emitted when electron in hydrogen atom undrgoes transition from higher energy state (quantum number n_i ) to the lower state ( n_f ). When electron in hydrogen atom jumps from energy state n_i=4 to n_f=3,2,1 , identify the spectral series to which the emission lines belong.

Using Rutherford model of atom , derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron ?

Derive the equation for radius of n th shell form Bohr theory.

Derive the expression of 1st Bohr orbit applying Bohr’s 'theory.

In Bohr's model of hydrogen atom ,

If the radius of first Bohr orbits of Hydrogen atom is 0.5overset@A , Find the radius of the fourth Bohr Orbit of the atom.

State the postulates of Bohr's model of hydrogen atom .