Naturally radioactive nuclei can decay spontaneously by emitting ...

[leilurhhh]

Naturally radioactive nuclei can decay spontaneously by emitting the following particles:
 a. helium nuclei, electrons, photons
  b. electrons, neutrons, protons
  c. helium nuclei, electrons, protons
  d. electrons, neutrons, photons
  e. quarks and leptons

Question 2

How many radioactive atoms are present in a sample that has an activity of 0.5 mCi and a half-life of 10 years? (1 curie = 3.7  1010 decays/s)
 a. 9.5  1012 atoms
  b. 8.4  1012 atoms
  c. 7.3  1012 atoms
  d. 6.5  1012 atoms
  e. 2.7  105 atoms

[robbielu01]

Answer to Question 1

A

Answer to Question 2

B

[leilurhhh]

Thanks for the timely response, appreciate it

[olderstudent]

Gracias!