Question

which statement is true about nuclear fusion?
it is caused by the same process that causes nuclear fission.
it does not occur naturally in the solar system.
it has very low activation energy.
it produces nearly all the elements that are heavier than helium.

Explanation:

• Analyze each option:
• Option 1: Nuclear fusion (combining nuclei) and fission (splitting nuclei) have different processes, so this is false.
• Option 2: Nuclear fusion occurs naturally in the Sun (solar system), so this is false.
• Option 3: Nuclear fusion requires extremely high temperature and pressure (high activation energy), so this is false.
• Option 4: Nuclear fusion in stars produces elements heavier than helium (up to iron in most stars, and heavier elements in supernovae via fusion - related processes), so this statement is true.

Answer:

It produces nearly all the elements that are heavier than helium.