why fission is involved in nuclear chain reactions and not fusion and how the hiroshima bomb dealt a great damage to the city of tokyo nagasaki?
Answers
Hey mate, that's a very gd qn you've asked!
Answer:
fission reaction occurs, when a fast (or slow) moving neutron is bombarded on a heavy nucleus, which results in the release of energy and also of the corresponding light nuclei.
this reaction is uncontrolled as well as controlled. the concept of controlled reaction is used in the nuclear reactors, while the uncontrolled reaction is used in the bombing of nagasaki and hiroshima, where excessive amount of heat energy, radioactive particles were realeased, resulting in immense damage.
Fusion is totally different. it requires very complicated and high conditions for its reaction to take place. temperature of more than 10^7 K and many more conditions are required to combine the two light nuclei into one heavy and large nucleus.