The half life of `._92U^(238)` against `alpha` -decay is `4.5xx10^9` years. What is the activity of 1g sample of `._92U^(238)`?

Explanation

To find the activity of a 1g sample of Uranium-238 (U-238), we can follow these steps:

### Step 1: Understand the Given Information
We are given:
- Half-life of U-238, \( t_{1/2} = 4.5 \times 10^9 \) years.

### Step 2: Convert Half-life to Seconds
Since activity is usually expressed in disintegrations per second, we need to convert the half-life from years to seconds.
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