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The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is

1. 10 microgram
2. 20 microgram
3. 40 microgram
4. 1 microgram

Correct answer: 20 microgram

Solution

The energy released per fission of U235 is approximately 200 MeV. Using E=mc², we calculate the mass equivalent of the energy produced in 1 hour (1000 kW × 3600 s). This gives a mass decay of approximately 20 micrograms.

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