If u and d represent up quark and down quark respectively then composition of Proton and Neutron can be written as:
Correct answer: C. Proton: 2u + 1d, Neutron: 1u + 2d
- A. Proton: 1u + 1d, Neutron: 2u + 1d
- B. Proton: 2u + 2d, Neutron: 2u + 1d
- C. Proton: 2u + 1d, Neutron: 1u + 2d
- D. Proton: 1/3 u + 2/3 d, Neutron: 2/3 u + 1/3 d
- E. Proton: 1/3 u + 1/3 d, Neutron: 2/3 u + 2/3 d
Explanation
Protons and neutrons are composed of quarks. Protons contain two up quarks and one down quark, while neutrons contain one up quark and two down quarks. Therefore, the composition of proton and neutron can be written as:Proton: 2u + 1dNeutron: 1u + 2d
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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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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