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Calculate frequency of revolution of ele...

Calculate frequency of revolution of electron in 4th Bohr orbit `Be^(+3)` ion .
Given that `(pi^(2)me^(4)k^(2))/(h^(3)) = 1.62 xx10^(15) sec^(-1),` symbols have usual meaning.
Express your answers in terms of `10^(15) sec^(-1).`
Write the answer upto one significant figure.

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