at night, the demand for electricity supplied by a fission nuclear reactor decreases. how is the fission…

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?\nthe temperature of the reactor is lowered because high temperature and pressure are needed.\nthe temperature of the reactor is raised because the reaction slows down at higher temperatures.\nthe exposure between the fuel rods and a neutron - absorbing material is increased.\nthe exposure between the fuel rods and a neutron - absorbing material is reduced.

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?\nthe temperature of the reactor is lowered because high temperature and pressure are needed.\nthe temperature of the reactor is raised because the reaction slows down at higher temperatures.\nthe exposure between the fuel rods and a neutron - absorbing material is increased.\nthe exposure between the fuel rods and a neutron - absorbing material is reduced.

Answer

Brief Explanations:

In a fission nuclear reactor, the reaction rate is controlled by neutrons. Neutron - absorbing materials can absorb neutrons. When the demand for electricity decreases, increasing the exposure between fuel rods and a neutron - absorbing material reduces the number of neutrons available to cause further fission reactions, thus slowing down the reaction and avoiding over - production of electricity. High temperature and pressure are not the main way to control the reaction rate for this purpose, and the reaction generally speeds up at higher temperatures rather than slowing down.

Answer:

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