If the mass of electron is reduced to half, Rydberg constant :

Given the electronic charge $e=1.6\times {10}^{-19} \mathrm{C}$, electronic mass $m=9.1\times {10}^{-31} \mathrm{kg}$ ,plank's constant $h=6.64\times {10}^{-34} \mathrm{J} \mathrm{s}$ and speed of light $c=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$. The radius of first orbit of electron in hydrogen atom is:

Given the electronic charge $\mathrm{e}=1.6\times {10}^{-19} \mathrm{C}$, electronic mass $\mathrm{m}=9.1\times {10}^{-31} \mathrm{kg}$ ,plank's constant $\mathrm{h}=6.64\times {10}^{-34} \mathrm{J} \mathrm{s}$ and speed of light $\mathrm{c}=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$. The velocity of the electron in the first orbit is:

Given the electronic charge $\mathrm{e}=1.6\times {10}^{-19} \mathrm{C}$, electronic mass $\mathrm{m}=9.1\times {10}^{-31} \mathrm{kg}$ ,plank's constant $\mathrm{h}=6.64\times {10}^{-34} \mathrm{J} \mathrm{s}$ and speed of light $\mathrm{c}=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$. The time period of revolution of the electron in the first orbit is: GIven $\mathrm{v}=2.2\times {10}^6 \mathrm{m} {\mathrm{s}}^{-1}$ and $r=0.53 \stackrel{\circ }{A}$.

Given the electronic charge $\mathrm{e}=1.6\times {10}^{-19} \mathrm{C}$, electronic mass $\mathrm{m}=9.1\times {10}^{-31} \mathrm{kg}$ ,plank's constant $\mathrm{h}=6.64\times {10}^{-34} \mathrm{J} \mathrm{s}$ and speed of light $\mathrm{c}=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$. The frequency (in Hertz) of revolution of the electron in the first orbit is  :

Given $r=0.53 \stackrel{\circ }{A}$ and $\mathrm{v}=2.2\times {10}^6 \mathrm{m} {\mathrm{s}}^{-1}$