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if the frequency of Ka X-ray emitted fro...

if the frequency of `K_a` X-ray emitted from the element with atomic number 31 is f, then the frequency of `K_a` x-ray emitted from the element with atomic number 51 would be

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`sqrt(f) a=(Z-1)`
`sqrt(f) a(31-1)`
`sqrt((25f)/x) =a(51-1)`
x=9
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