Question

_{92}^{235}u+{_{0}^{1}n}\to{_{36}^{92}kr}+{_{56}^{141}ba}
nuclear fission describes a nuclear reaction in which a heavy nucleus, such as uranium, is bombarded by neutrons causing the atom to split into two or more smaller atoms. the fission reactions take relatively little energy input to occur and do not occur in nature. fission produces many highly radioactive particles and releases large amounts of energy.
predict the changes in the nucleus as uranium - 235 is split in a nuclear reactor.
a energy decreases as two stable atoms are formed and gamma radiation discharges.
b splitting uranium - 235 decreases the energy and emits positron and beta particles.
c uranium - 235 splits into barium - 141 and krypton - 92 and alpha radiation is emitted.
d when uranium - 235 is split, three neutrons and a large amount of energy are released.

Explanation:

In nuclear fission of uranium - 235, a neutron bombards it causing it to split into smaller atoms like barium - 141 and krypton - 92, and also releases three neutrons and a large amount of energy. Gamma radiation is also often released but the main characteristic is the release of neutrons and energy. Option A is wrong as energy is released not decreased in a useful sense. Option B mentions positron and beta particles which are not typical in this fission reaction. Option C mentions alpha radiation which is not characteristic of this fission.

Answer:

D. When uranium - 235 is split, three neutrons and a large amount of energy are released.