The neutron is assumed to be made of:
Correct answer: A. One up quark and two down quarks.
- A. One up quark and two down quarks.
- B. Up quarks and two down quarks.
- C. Two up quarks and one down quark.
- D. One up quark and one down quark.
Explanation
The sum of the relative masses of one up quark and two down quarks is equal to the mass of a neutron and the overall charge by adding the charge of one up quark and one down quark will give an overall charge of zero which is the charge of a neutron. The charge of one up quark is +2/3e and the charge of one down quark is -1/3e. Therefore 2(-1/3)+(+2/3) = 0
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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