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Question

8. An x-ray beam is composed of equal intensities of 30 pm x-rays and 50 pm x- rays. The x
ray beam is now directed upon a material whose linear absorption coefficient for 30 pm xrays and 50-pm x-rays are 0.30 mm-1 and 0.72 mm-1 respectively. How thick is the
material if the exiting x-ray beam is composed of twice as many 30 pm x-rays as 50-pm xrays?

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