If in Bohr's model, for unielectronic atom, time period of revolution is represented as `T_(n,z)` where `n` represents shell no. and `z` represents atomic number then the value of `T_(1.2) : T_(2.1)` will be :-

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(nz) where n represents shell number and z represents atomic number then the value of T_(12):T_(21) will be

in bohr model of hydrogen atom, rhe ratio of period of revolution of an electron in n=2 and n=1 orbits is

In Bohr model of hyrogen atom, the ratio of periods of revolution of an electon in n = 2 and n = 1 orbit is

If in Bohr.s model, for uni electronic atom following symbols are used : r_(n, Z) rarr Radius of n^(th) orbit with atomic number z U_(n, Z) rarr Potential energy of e^(-) K_(n, Z) rarr Kinetic energy of e^(-) V_(n,Z) rarr Velocity of e^(-) T_(n, Z) rarr Time period of revolution

Each shell in an atom is usually represented by a number represented as:

It Z represent the atomic number and A represents mass number, then the number of electrons in an atom can be computed as

In Bohr.s model of hydrogen atom, the ratio between the period of revolution of an electron in orbit n=1 to the period of the electron in the orbit n=2 is