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The energy ratio of two k(alpha) photons...

The energy ratio of two `k_(alpha)` photons obtined in `x` -ray from two metal targets of atomic numbes, `Z_(1)` and `Z_(2)` is ,

A

`(Z_(1))/(Z_(2))`

B

`((Z_(1))/(Z_(2)))`

C

`((Z_(1)-1)/(Z_(2)-1))^(2)`

D

`sqrt(((Z_(1)-1))/((Z_(2)-1)))`

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