Question

At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity? The temperature of the reactor is lowered because high temperature and pressure are needed. The temperature of the reactor is raised because the reaction slows down at higher temperatures. The exposure between the fuel rods and a neutron-absorbing material is increased. The exposure between the fuel rods and a neutron-absorbing material is reduced.

Answer 1

The exposure between the fuel rods and a neutron-absorbing material is increased.

Step-by-step explanation:

Answer 2

The exposure between the fuel rods and a neutron-absorbing material is increased.

A nuclear reactor produces energy via a fission reaction. A fission reaction is a self sustaining reaction.

The nuclear fuel is bombarded with neutrons. The process produces more neutrons which continues the reaction.

In order to decrease the rate of reaction, control rods are inserted. These control rods are neutron-absorbing materials.

At night when demand for electricity decreases, the exposure between the fuel rods and a neutron-absorbing material is increased so that more neutrons are absorbed in order to decrease the rate of nuclear reaction.