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Many diseases, including COVID-19, spread because the virus is carried by tiny particles (diameter 10...

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Many diseases, including COVID-19, spread because the virus is carried by tiny particles (diameter 10 m) suspended in air, emitted when people sneeze, cough, exhale, and talk. A recent study found that these suspended particles have an effective diffusion coefficient of 1.6 x 10- m/s. We have often been advised to stay 6 feet (1.83 m) away from other people in order to reduce the likelihood of contracting COVID-19. For the given diffusion coefficient, how much time would it take for these particles to diffuse this distance? Assume 3D diffusion.

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