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A) Neutral particles interact by random collisions in matter. When a beam of 37.0 MeV neutrons goes through a concrete slab 12.0 cm thick, about 50.7 per cent of the neutrons will not interact, and thus keep on going. What percentage of the neutrons would not interact if the concrete slab were made 36.0 cm thick? I know this is 1.305x10^1. B) How many centimeters thick would the concrete need to be so that 18.0 per cent of the neutrons are transmitted?

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