Choose the one alternative that best completes the statement or answers the ques

Question

Choose the one alternative that best completes the statement or answers the question Circle the correct answer on the exam. Write a nuclear equation for the alpha decay of^236 _94 Pu. A)^236 _94 Pu rightarrow^0 _-1 e+^236 _93 Np B)^236 _94 Pu rightarrow^4 _2 he +^232 _92 U C)^236 _94 Pu rightarrow^0 _-1 e+^232 _92 Am D)^236 _94 Pu rightarrow^0 _+1 e+^236 _93 np E)^236 _94 Pu rightarrow^1 _0 n+^235 _94 Pu Determine the identity of the daughter nuclide from the positron emission of^15 _8 O. A)^14 _7 N B)^11 _6 C C)^15 _6 C D)^16 _9 F E)^15 _7 N Determine the identity of the daughter nuclide from the electron capture by^230 _91 Pa. A)^230 _90 Th B)^230 _92 U C)^226 _89 Ac D)^234 _93 np E)^229 _90 Th Which of the following statements is TRUE? A) If N/Z ratio is too low, there are too many neutrons and the nuclide will undergo beta decay. B) If N/Z ratio is too high, there are too many protons and the nuclide will undergo positron emission or electron capture. C) If N/Z ratio lies somewhere below 1, the nuclide is stable. D) The valley of stability is the geographic location where many of the known nuclides were first discovered. E) None of the above are true. A geological sample is found to have a Pb-206/U-238 mass ratio of 0337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 times 10^9 years. A) 2.1 times 10^9 years B) 7.3 times 10^11 years C) 7.1 times 10^9 years D) 1.4 times 10^10 years E) 2.4 times 10^10 years E> 2> 1

Explanation / Answer

(1)

(B) Alpha particle is dipositive nucleii of helium.(42He2+)

So, loss of alpha particle decrease the atomic number by two units and mass number by four units.

(2) (A)

Because, poton is emitted. 11H.

Emission of proton decreases the atomic number by 1 unit and mass number by 1 unit.

(3) (B)

Because, electron is 0-1e

So, capture of electron increase the atomic nubmer by 1 unit and no change in mass number.

(4) (C)

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