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Two elements A and B with atomic numbers `Z_(A)` and `Z_(B)` are used to produce characteristic X-rays with frequencies `v_(A)` and `v_(B)` respectively. If `Z_(A):Z_(B)` 1:2, then `v_(A) :v_(B)` will be

A

`1:sqrt2`

B

`1:8`

C

`4:1`

D

`1:4`

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