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A slab of material of thickness 1.0 cm reduces the amount of radiation by a factor...

A slab of material of thickness 1.0 cm reduces the amount of radiation by a factor of 4.0. How much is the radiation reduced (from its original amount) if you use a 3.0 cm thickness of this material? (Answer by the factor by which it's reduced, so your answer should be > 1; e.g., if it's cut in 1/2, you would answer 2.)

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