1.

X-ray beam of intensity \[{{I}_{0}}\]passes through an absorption plate of thickness d. If absorption coefficient of material of plate is \[\mu \], the correct statement regarding the transmitted intensity I of X-ray is                                             [MP PET 1999]

A.            \[I={{I}_{0}}(1-{{e}^{-\mu d}})\]                                     
B.            \[I={{I}_{0}}{{e}^{-\mu d}}\]
C.                    \[I={{I}_{0}}(1-{{e}^{-\mu /d}})\]                            
D.                    \[I={{I}_{0}}{{e}^{-\mu /d}}\]
Answer» C.                    \[I={{I}_{0}}(1-{{e}^{-\mu /d}})\]                            


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