The Theory of Nuclear Astrophysics Is That All the Heavy

question 39

Short Answer

The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. These stars eventually explode, releasing these elements into space. If we assume that at the time of the explosion there were equal amount of U-235 and U-238, how long ago did the star(s) explode that released the elements that formed our Earth? The present U-235/U-238 ratio is 0.0070. [The half-lives of U-235 and U-238 are 0.7 × 10⁹ yr and 4.47 × 10⁹ yr.]

---

Definitions:

Expansionary Gap

A situation in an economy where the real GDP is higher than the potential GDP, often leading to inflation.

Active Approach

A strategy, especially in investing or management, where decisions are made based on hands-on involvement and regular assessment of conditions.

SRAS Curve

Short-Run Aggregate Supply Curve represents the relationship between the total supply of goods and services produced by a country and the price level in the short term, holding wages and input prices constant.

Active Approach

A strategy involving regular and direct intervention or actions to achieve a particular goal or outcome.