Question

which of these is a by - product of nuclear fusion? explosions energy there are no major by - products

Explanation:

Nuclear fusion primarily produces energy. While in some cases like in a hydrogen bomb (a type of uncontrolled nuclear fusion) there are explosions, in controlled nuclear fusion (like what is being researched for energy production), the main goal is to harness energy. Also, compared to nuclear fission (which has radioactive by - products), nuclear fusion has relatively few major long - lived radioactive by - products. But the question is about the by - product. Energy is the main output (similar to how in a chemical reaction, heat can be considered an output/by - product in a sense of the overall process outcome).

Answer:

energy