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(B) The velocity of an electron in the $n^{th}$ orbit of a hydrogen-like species is given by the formula $V_n = V_0 	imes \frac{Z}{n}$.Since $V_0$ an

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$1 : 1/2 : 1/3$

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(B) The velocity of an electron in the $n^{th}$ orbit of a hydrogen-like species is given by the formula $V_n = V_0 	imes \frac{Z}{n}$.Since $V_0$ and $Z$ are constant for a given species,the velocity is inversely proportional to the principal quantum number $n$ $(V \propto \frac{1}{n})$.Therefore,the ratio of velocities for the first,second,and third orbits is $V_1 : V_2 : V_3 = \frac{1}{1} : \frac{1}{2} : \frac{1}{3}$.

For a hydrogen-like species,the ratio of velocities of electrons in the $I, II,$ and $III$ orbits,i.e.,$V_1 : V_2 : V_3$,will be:

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