Nuclei - Result Question 27

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

(a) 10 microgram

(b) 20 microgram

(c) 40 microgram

(d) 1 microgram

[2011]

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Answer:

Correct Answer: 28. (c)

Solution:

(c) E=mc2

m=Ec2

So, mass decay per second dmdt=1c2dEdt=1c2 (Power in watt)

=1(3×108)2×1000×103

and mass decay per hour =dmdt×60×60

=1(3×108)2×106×3600=4×108kg

=40 microgram



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