Sally asked in Science & MathematicsPhysics · 4 months ago

PHYSICS!!! help?

1) If a Polonium-211 nucleus decays by alpha decay, what is the daughter nucleus?

2)If Actinium-227 decays by beta decay, what is the daughter nucleus?

3)If you have 120 atoms of a radioactive material with a half-life of 50 s, how many of the original atoms will you still have after 100 s?

4)Ionization smoke detectors contain small amount of a radioactive source. Which would be a better choice of source if you wanted to make a detector with a “lifetime guarantee” that would produce a fairly constant signal over a person's lifetime?

a)1 g of a material with a half-life of 400 years

b)10 g of a material with a half-life of 40 years

c)both would be equally effective

d)neither would be effective

1 Answer

Relevance
  • 4 months ago

    1) If a Polonium-211 nucleus decays by alpha decay, what is the daughter nucleus?

    Ans: Pb-2072)If Actinium-227 decays by beta decay, what is the daughter nucleus?Ans: Ac-2283)If you have 120 atoms of a radioactive material with a half-life of 50 s, how many of the original atoms will you still have after 100 s?By Nt = No x (1/2)^n=>N(t) = 120 x (1/2)^(100/50)=>N(t) = 120 x (1/2)^2=>N(t) = 30 atoms4)Ionization smoke detectors contain small amount of a radioactive source. Which would be a better choice of source if you wanted to make a detector with a “lifetime guarantee” that would produce a fairly constant signal over a person's lifetime?c)both would be equally effective 

Still have questions? Get your answers by asking now.