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The intensity of \( X \)-rays absorbed in \( I_{a} \) and initial
\( \mathrm{P} \) intensity is \( I_{0} \). Then \( I_{a} \) is given by-
\( \mathrm{W} \)
(1) \( \mathrm{I}_{\mathrm{a}}=\mathrm{I}_{0} \mathrm{e}^{-\mu \mathrm{x}} \)
(2) \( \mathrm{I}_{\mathrm{a}}=\mu \mathrm{I}_{0} x \)
(3) \( \mathrm{I}_{\mathrm{a}}=\mathrm{I}_{0}\left(1-e^{-\mu \mathrm{r}}\right) \)
(4) \( \mathrm{I}_{\mathrm{a}}=\mathrm{I}_{0}\left(1-e^{\mu \mathrm{r}}\right) \)
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