Question

State Bohr's second postulate for the atomic model. Express it in its mathematical form.  

Answer 1

Bohr’s second postulate:

The radius of the orbit of an electron can only take certain fixed values such that the angular momentum of the electron in these orbits is an integral multiple of `h/(2π)`, h being Planck’s constant. 

Mathematical form: m_er_nv_n = `"nh"/(2pi)`

where, m_e = mass of electron, r_n = radius of n^th Bohr’s orbit, v_n = linear velocity of electron in n^th orbit, n = principal quantum number.