411 REFERENCE · Wikibooks
A-level Physics (Advancing Physics)/Fission/Worked Solutions
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1. A neutron is fired at some Uranium-235. Barium-141 and Krypton-92 are produced:
How many neutrons are produced (i.e. what is the value of N)?
Consider the mass numbers:
2. What proportion of the neutrons produced must be absorbed in order to make the reaction stable?
Two thirds, assuming that Uranium-235 always produces three neutrons when split, which it doesn't.
3. What would happen if too many neutrons were absorbed?
The reaction would stop.
4. Alternatively, Uranium-235 can split into Xenon-140, two neutrons and another element. What is this element? (You will need to use a periodic table.)
Consider the mass numbers:
Then consider the atomic numbers:
So, the element is strontium-94: