Question

1. which type of nucleosynthesis produces massive amounts of hydrogen and helium atoms?

supernova nucleosynthesis
big bang nucleosynthesis
dematerialization nucleosynthesis
cosmic ray spallation

Explanation:

• Supernova nucleosynthesis: Produces heavier elements (beyond iron) through the explosion of massive stars.
• Big - bang nucleosynthesis: Occurred in the early universe (first few minutes) and is responsible for forming most of the hydrogen (\(H\)) and helium (\(He\)) in the universe.
• Dematerialization nucleosynthesis: Not a standard nucleosynthesis process in astrophysics.
• Cosmic - ray spallation: Breaks down heavier nuclei into lighter ones (e.g., produces some light elements like lithium, beryllium, and boron from heavier nuclei in interstellar medium due to cosmic - ray interactions).

Answer:

big bang nucleosynthesis