Q .     The wavelengths of `K_\alpha` X-rays for lead isotopes `Pb^{208}, Pb^{206}` and `Pb^{204}` are `\lambda_1, \lambda_2` and `\lambda_3 ` respectively. Then

AIIMS 2009
A

`\lambda_2 = \sqrt{\lambda_1\lambda_3}`

B

`\lambda_2 = \lambda_1+\lambda_3`

C

`\lambda_2 = \lambda_1\lambda_3`

D

`\lambda_2 = \frac{\lambda_1}{\lambda_3}`

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