Tritium has a half-life of 12.5 years. What fraction of the sample will remain undecayed after 50 years?

Explanation

To find the fraction of a tritium sample that remains undecayed after 50 years, we can follow these steps:

### Step 1: Identify the half-life
The half-life of tritium is given as 12.5 years.

### Step 2: Determine the total time elapsed
We need to find out how much time has passed, which is given as 50 years.

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