Tritium Is an Isotope of Hydrogen That Has Two Neutrons $\beta$

question 5

Multiple Choice

Tritium is an isotope of hydrogen that has two neutrons in addition to its proton. Tritium undergoes $\beta$ ^- decay with a half-life of 12.3 years. What percentage of an initially pure sample of tritium will remain undecayed after 35 years?

• A)2.9 %
• B)6.0 %
• C)7.0 %
• D)14 %
• E)19 %

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