ocesses (1) (3 pts) Write the particle that is emitted in the following nuclear

Question

ocesses (1) (3 pts) Write the particle that is emitted in the following nuclear pr (a) Gold-198 decays to mercury-198 (b) Radon-222 decays to polonium-218 (c) Potassium-40 decays to argon-40. Ans Ans. Ans. (2) (3 pts) Write the daughter nucleus product, expressed as ?Sy, in the following nuclear processes: (a) Beta emission of manganese-56. (b) Gallium-67 decays by electron capture. (c) Potassium-38 decays by positron emission. Ans. (3) (3 pts) For each of the following pairs of isotopes, which one would you expect to be radioactive? Ans Ans Ans. (a) 8Br or SBr. (b) 8Fe or 5*Co. (c) 20"Hg or 208Pb. (4) (3 pts) A sample of bone is subjected to radiocarbon dating. The current decay rate observed for its carbon-14 content is 11.2 disintegrations per minute per gram of carbon. What is the age (in years) of the bone? The half- life for carbon-14 is 5.73x103 yrs., and the decay rate for carbon-14 in living organisms is 15.3 disintegrations per minute per gram of carbon.

Explanation / Answer

1)
a)
Here mass number is same
Atomic number of mercury is one larger than that of gold
that is atomic number increases by 1

This is beta emission
Answer: beta particle

b)
Here mass number decreases by 4
atomic number decreases by 2
This is alpha emission
Answer: alpha particle

c)
Here mass number is same
atomic number decresses by 1
This is positron emission
Answer: positron

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