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The super-Kamiokande experiment searches for protons decays by monitoring 20 million kilograms of water for decay...

The super-Kamiokande experiment searches for protons decays by monitoring 20 million kilograms of water for decay events. Given that a single proton has a mass of 1.67 x 10^-27 kg, how many decays would you expect on average in one year of observation if it takes 10^40 years for a single proton to decay?

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