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The distance between 4th and 3rd Bohr or...

The distance between 4th and 3rd Bohr orbits of `He^(+)` is :

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`r=0.529(n^(2))/(Z)Å, r_(4)-r_(3)=0.529((16)/(2)-(9)/(2))Å=1.851xx10^(-10)m`
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