Question

question 1 - 10
a fusion nuclear reaction occurs when -
heavier nuclei break into lighter nuclei
helium nuclei fuse together to form uranium
lighter nuclei combine to form heavier nuclei
uranium nuclei split up to form hydrogen

Explanation:

Nuclear fusion is a process where lighter nuclei combine to form heavier nuclei. Option 1 describes nuclear fission. Option 2 is incorrect as helium nuclei do not fuse to form uranium. Option 4 is also incorrect as uranium splitting is fission and does not form hydrogen in that context.

Answer:

lighter nuclei combine to form heavier nuclei