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\[Pb[{{Z}_{Cu}}=29,\,{{Z}_{Be}}=4,\,{{Z}_{Pb}}=82,\,{{Z}_{Au}}=79]\]
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