When X-rays of wavelength 0.5 Å would be transmitted by
an aluminium tube of thickness 7 mm, its intensity remains
one-fourth. The attenuation coefficient of aluminium for
these X-rays is
(a) 0.188 mm⁻¹ (b) 0.189 mm⁻¹
(c) 0.198 mm⁻¹ (d) None of these
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