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1. Polonium-209, an α emitter, has a half-life of 102 years. How many α particles are...

1. Polonium-209, an α emitter, has a half-life of 102 years.

How many α particles are emitted in 1.5 s from a 1.2 ng sample of 209Po?

2. A 1.0 mg sample of 126Sn decays initially at a rate of 4.6×105 disintegrations/s.

What is the half-life of 126Sn in years?

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1) Initial mass of Polonium-209, No 1.2 ng Write the equation Eor decay follows Given half-life, 4a 102 years Calculate the r

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