Tritium (³H) Is Used in Glowing "EXIT" Signs Located Where

question 123

Multiple Choice

Tritium (³H) is used in glowing "EXIT" signs located where there is no electricity for lightbulbs. If the half-life of tritium is 12.26 years, what percentage of the original quantity of the isotope is left in the sign after 18.5 years?

• A)0.632%
• B)63.2%
• C)35.1%
• D)1.51%
• E)25.0%

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