Which of the following statements is true (or most correct)? Nuclei generally co

Question

Which of the following statements is true (or most correct)? Nuclei generally contain more protons than neutrons. Photons can have no momentum since they have no mass. Protons do not attract other protons in the nucleus, only neutrons. Two electrons can not have the same quantum numbers due to the Pauli Exclusion Principle. E. Heisenberg's Uncertainty Principle says that we can not accurately measure the position of a particle 23. A patient is injected with a 1200-mCi (4.4 times 10^10 Bq) radioisotope for a medical procedure. The activity is monitored and plotted for 5 days as shown. When (since the injection) will the activity be reduced to 19 mCi?

Explanation / Answer

(A) ----> proton-proton repulsion makes the atom unstable, so the more neutrons are required to balance
this unstability.

(B) ----> Photons of enrrgy E have momentum p = E/c

(C) ----> In nucleus, the proton intracts with neutron and proton by exchange of gluons hence the strength
of force is equal.

(D) ----> From pauli exclusion principle, the two electrons are in supposed to be in different states. hence different quantum number.

(E) ----> Heisenberg uncertainty principle states that we can not measure the position and momentum of a particle
simultaneously.

Hence (D) is only correct option.

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