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Ratio of two masses from a fission source

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Two detectors placed symmetrically on either side of a fission source, record two fission fragments (A) and (B) from a fission event. If the flight time for (A) is 20% greater than of (B), calculate the ratio of the masses of (A) and (B). Which has the most energy?

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This posting provides calculations for the ratio of two masses and describes which has more energy.

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There are some implicit assumptions omitted in the question of which one should be aware:
(a) There are only the two fission fragments A and B and no other remnants of the nucleus.
(b) The nucleus was at rest when it fissioned
There is also a practical ...

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