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

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The distance between `4th` and `3rd` Bohr orbits of `He^(+)` is `:`
A. `2.645xx10^(-10)m`
B. `1.322xx10^(-10)m`
C. `1.851xx10^(-18)m`
D. None
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`r=0.529(n^(2))/(Z)A,`
`r_(4)-r_(2)=0.529((16)/(2)-(9)/(2))A=1.851xx10^(-10)m`
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