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Our atmosphere provides us with some degree of shielding from cosmic radiation. Suppose shielding efficiency is approximately proportional to the shield material's density. What depth

Our atmosphere provides us with some degree of shielding from cosmic radiation. Suppose shielding efficiency is approximately proportional to the shield material's density. What depth of water will provide the same shielding as the Earth's atmosphere? (Hint: the pressure at the surface of the Earth is 1 atm)

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