Nuclear Physics

The correct answer is option (C): ln(2)

Step 1: Understanding the nuclear fusion reaction.
In nuclear fusion reactions, when hydrogen nuclei fuse, the product is typically a helium nucleus and energy. The missing product is the helium nucleus ( ) with a specific energy value.
Step 2: Applying the known energy values.
The energy released during the fusion of hydrogen atoms to form helium in this reaction is known to be approximately .
Step 3: Conclusion.
The correct answer is (C) .

Step 1: Understanding the concept of energy in head-on collisions.
For a head-on collision, the total energy can be calculated using the formula for the interaction between two bodies at a given distance. The energy depends on the force and potential energy between the particles.
Step 2: Applying the formula for energy.
Given the distance of 2 fm (femtometer), the total energy for the collision is approximately .
Step 3: Conclusion.
The correct energy is , so the correct answer is (A).