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A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how ...

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

A. 75,000 particles
B. 35,000 particles
C. 25,000 particles
D. 50,000 particles




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