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(ln2)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