A Bohr's hydrogen atom undergoes a transition `n = 5 to n = 4` and emits a photon of frequency `f`. Frequency of circular motion of electron in `n = 4 orbit is f_(4)`. The ratio `f//f_(4)` is found to be `18//5 m`. State the value of `m`.

When a hydrogen atom emits a photon during a transition from n = 4 to n = 2, its recoil speed is about ,

If in hydrogen atom, radius of n^(th) Bohr orbit is r_n ., frequency of revolution of electron in n^(th) orbit is f_n choose the correct option.

When an electron in a hydrogen atom makes a transition from 2^("nd") excited state to ground state. It emits a photon of frequency f.The frequency of photon emitted when an electron of Li^("++") makes a transition from 1^("st") excited state to ground state is :

In hydrogen atom electron jumps from (n+1)th state to nth state the frequency of emitted photon is directly proportional to (n>>1)

If, in a hydrogen atom, radius of nth Bohr orbit is r_(n) frequency of revolution of electron in nth orbit is f_(n) and area enclosed by the nth orbit is A_(n) , then which of the pollowing graphs are correct?

If, in a hydrogen atom, radius of nth Bohr orbit is r_(n) frequency of revolution of electron in nth orbit is f_(n) and area enclosed by the nth orbit is A_(n) , then which of the pollowing graphs are correct?