If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next room? (Assume the wall between rooms is composed of concrete.)

Alpha particles have very low penetrating power and are stopped by a short distance of air or a thin barrier. A concrete wall will block them before they reach the person in the next room, so the person will receive no alpha radiation from the sample. The correct choice is A, “None, because the wall will block the radiation.”

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