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a. A radioactive substance has a mean-life of 19 years. Assume we start with111 kg of the substance. How many kg of the substance will

a. A radioactive substance has a mean-life of 19 years. Assume we start with111 kg of the substance. How many kg of the substance will be left after 23 years?

Enter a number with one digit after the decimal point.

b. Which one isthe mostmassive of the particles listed below?

Group of answer choices

gamma ray

alpha particle

electron

neutron

proton

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