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1. A small cube of lead is embedded in a big cube 9. (a) Wof aluminium metal. It is placed in the path of apowerful radioactive emission, such that on theopposite side of the cube is placed a fluorescentscreen. It is observed that the shadow formed byaluminium metal is lighter than the lead metal. Stateone reason for the above phenomenon.12003]ele(b) Ede

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