When X-rays of wavelength 0.5A pass through 7mm thick aluminum sheet, then their intensity reduces to one fourth. The coefficient of absorption of aluminum for these X-rays will be
A
0.198mm−1
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B
0.227mm−1
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C
0.752mm−1
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D
0.539mm−1
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Solution
The correct option is C0.198mm−1 The main equation in play here is. I=I0eμx Given that intensity reduces by one fourth.