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A sheet of aluminum 1 mm thick reduces the intensity of a monochromatic x ray beam to 23.9% of at original value. what is the wave length of xray.

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Hi Fahim - this is a site for conceptual questions about physics, not a place to get people to do your homework for you. If you edit your question to focus on the conceptual issue that's giving you trouble, I'll be happy to reopen it. See our homework policy for more information. – David Zaslavsky♦ Dec 16 '12 at 4:43

closed as too localized by David Zaslavsky♦ Dec 16 '12 at 4:40

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