A) \[I={{I}_{0}}(1-{{e}^{-\mu d}})\]
B) \[I={{I}_{0}}{{e}^{-\mu d}}\]
C) \[I={{I}_{0}}(1-{{e}^{-\mu /d}})\]
D) \[I={{I}_{0}}{{e}^{-\mu /d}}\]
Correct Answer: B
Solution :
If intensity of X-ray is decreased by dI, when it passes through a length dx of absorbing material then, the amount of observed intensity is mI dx. Thus, ? dI = mI dx or \[\frac{dI}{dx}+\mu I=0\] On solving this equation I = I0e? mx =I0e?md (x =d)
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