A) Cu
B) Au
C) Be
D) \[Pb\]
Correct Answer: D
Solution :
X-rays are absorbed when they are incident on substance. Intensity of emergent X-rays\[I={{I}_{0}}{{e}^{-\mu x}}\] where\[x=\]thickness of absorbing medium, \[\mu =\]absorption coefficient. but \[\mu \propto {{\lambda }^{3}}\] \[\mu \propto {{v}^{3}}\] and \[\mu \propto {{Z}^{4}}\] Among the given elements Z is maximum for \[[{{Z}_{Cu}}=29,{{Z}_{Be}}=4,{{Z}_{pb}}=82,{{Z}_{Au}}=79]\]
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