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The wavelength for k(beta) x-ray of cert...

The wavelength for `k_(beta)` x-ray of certain, material A is `15.53` pm .If takes `10KeV` to remove an electron from `M` - shell of `A` .What is the minimum accelerating potential that should be applied across the `x` -ray tube with target material `A`. So that a `k_(beta)` `x -ray` would be produced? Express answer in powers of `10^(4)` ? (Take `h=1242ev-nm`)

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