Radon has 3.8 days as its half-life . After how many days 25% of a radon sample remains undecayed ?

Explanation

To solve the problem, we need to determine how many days it takes for 25% of a radon sample to remain undecayed, given that its half-life is 3.8 days.

### Step-by-Step Solution:

1. **Understanding Half-Life**:
The half-life of a substance is the time required for half of the substance to decay. In this case, the half-life of radon is 3.8 days. This means that after 3.8 days, 50% of the original sample will remain.

2. **Determine Remaining Percentage**:
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