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If frequency of K(alpha) X-ray emitted f...

If frequency of `K_(alpha)` X-ray emitted from the element with atomic number 31 is `nu`, then the frequency of `K_(alpha)` X-ray emitted from the element with atomic number 51 would be

A

`9/25 nu`

B

`25/9 nu`

C

`3/5 nu`

D

`5/3 nu`.

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