Nuclear fusion

The video explains nuclear fusion, a process where two atomic nuclei combine to form a larger nucleus, releasing energy if the resulting nucleus is lighter than iron. This process powers stars, where hydrogen and helium fuse to create heavier elements.

What is the result of a nuclear reaction involving two atomic nuclei?

• A larger nucleus

• A smaller nucleus

• No change in nucleus size

• A split nucleus

Under what condition does fusion release energy?

• When the resulting nucleus is heavier than iron

• When the resulting nucleus is lighter than iron

• When the resulting nucleus is the same weight as iron

• When no nucleus is formed

What elements are primarily involved in the fusion process in stars?

• Carbon and oxygen

• Hydrogen and helium

• Iron and nickel

• Nitrogen and sulfur

What is the primary source of energy in stars?

• Chemical reactions

• Nuclear fission

• Gravitational collapse

• Nuclear fusion

What is created as a result of burning hydrogen and helium in stars?

• No elements

• Lighter elements

• A vacuum

• Heavier elements