The number of down quarks in a proton is:
Correct answer: D. 1
- A. 3
- B. 4
- C. 2
- D. 1
Explanation
The two types of particles that you need to know are hadrons and leptons. Particles that are affected by the strong nuclear force are called hadrons, like protons and neutrons. Leptons are particles that are affected by weak nuclear force, like electrons. Hadrons are made of quarks that have several flavors. Two of the aforementioned flavors are "up" and "down". The quark composition is such that the overall charge of the particle is maintained. If the particle in question is a proton, as in this case, the charge would be +1. Proton: u u d
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