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Q.

The average life of a W g sample of RaE200 is T seconds and the average energy of β-particles emitted is E MeV. AT what rate in watts does the sample emit energy?

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a

8WN0ET×10−16

b

8(ln⁡2)WN0ET×10−13

c

8WN0ET×10−13

d

None is correct

answer is A.

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Detailed Solution

Rate of β-particles emitted per second =λ×W Atomic weight ×N0=1T×W200×N0Energy evolved per second =1T×W200×N0×E×1.6×10−19×106Js−1=8WN0ET×10−16Ws−1
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