State one use of nuclear fission reactions.

Nuclear fission reactions produce energy which is used for generating electricity at a nuclear power plant.

Explanation

Nuclear fission - It is defined as the splitting of a heavy nucleus into two lighter or daughter nuclei through a nuclear reaction. The heavy nucleus is bombarded with neutrons, which results in the production of a high amount of energy.

Nuclear reactors are the heart of a nuclear power plant, which uses uranium as a nuclear fuel. They regulate and control nuclear chain reactions that produce heat through the physical process known as fission. And, this heat is used to make steam that spins a turbine to create electricity.