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Author Question: Naturally radioactive nuclei can decay spontaneously by emitting the following particles: a. helium ... (Read 92 times)

leilurhhh

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on: Jul 28, 2018
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


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robbielu01

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

B


leilurhhh

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Reply 2 on: Jul 28, 2018
Gracias!

patma1981

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Reply 3 on: Yesterday
Excellent

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