The power obtained in a reactor using U^235 disintegration is 1000 kW. The mass decay of U^235 per hour is

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

(a) 1 microgram

(b) 10 microgram

(c) 20 microgram

(d) 40 microgram

Ans: (d)

Sol: Energy , E = Pt = m c2

1000 × 103 × 3600 = m × (3 × 108 )2

m = (36 × 108)/(9 × 1016 )

= 4 × 10-8 kg

= 4 × 10-5 g

= 40 × 10-6 g

= 40 microgram

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