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What is the half-life of nuclide

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1. The decay constant of the nuclide is 3.417x10^-3s^-1. What is the half-life of this nuclide?

2. A sample contains 4.0x10^22 atoms of the sodium isotope 21/11 Na. The half-life of this nuclide 23s. How many atoms will be present in this sample after 10 minutes?

3. The mass of the isotope 25/11Na is 24.99u. How many atoms are in a sample of 25/11Na whose mass is 0.5g?

4. What is the activity of a 0.50g of sodium isotope 25/11Na at time t=1000s if it's activity at t=0 is 1.392x10^20s^-1? Can use the number of atoms obtained from the above problem

Reference no: EM132542824

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