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The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.1×1010 133Ba...

The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.1×1010 133Ba atoms.

How many are 133Ba atoms left in the sample after 4 years.

Express your answer using two significant figures.

How many are 133Ba atoms left in the sample after 30 years.

Express your answer using two significant figures.

How many are 133Ba atoms left in the sample after 190 years.

Express your answer using two significant figures.

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