Two nuclei have mass numbers in the ratio 2:5. What is the ratio of their nuclear densities?

Explanation

To solve the problem of finding the ratio of nuclear densities of two nuclei with mass numbers in the ratio of 2:5, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Mass Numbers:**
Let the mass numbers of the two nuclei be \( A_1 \) and \( A_2 \). According to the problem, we have:
\[
\frac{A_1}{A_2} = \frac{2}{5}
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