The half-life of radon is 3.8 days. After how many days `19/20` of the sample will decay ?

Explanation

To solve the problem of determining after how many days `19/20` of a radon sample will decay, we can follow these steps:

### Step 1: Understand the Initial Conditions
Let the initial number of radioactive nuclei be \( N_0 \). After some time \( t \), the number of remaining radioactive nuclei \( N_t \) will be:
\[ N_t = N_0 - \frac{19}{20} N_0 = \frac{1}{20} N_0 \]
This means that after \( t \) days, only \( \frac{1}{20} \) of the original sample remains.
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