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The ionization energy of a hydrogen like...

The ionization energy of a hydrogen like Bohr atom is `4` Rydberg. If the wavelength of radiation emitted when the electron jumps from the first excited state to the ground state is `N-m` and if the radius of the first orbit of this atom is `r-m` then the value of `(N)/(r )=Pxx10^(2)` then, value of `P`. (Bohr radius of hydrogen `=5xx10^(-11)m,1` Rydberg `=2.2xx10^(-18)J`)

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The correct Answer is:
`300.89A^(@),2.645xx10^(-9)cm`
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