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Fundamental Particles

Quarks and the structure of hadrons

  • 3 things to know
  • Unit A2 2

Overview

Three quarks needed at this level, charge of an antiquark compared with its quark and phenomenon called.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

Name the three quarks that make up the common hadrons

Key term

Give the charge of the up quark.

Key term

Give the charge of the down quark.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Name the three quarks needed at this level.

    Model answer

    The up quark, the down quark and the strange quark.

  2. 2

    Give the charge of the up quark.

    Model answer

    Plus two thirds of the elementary charge.

  3. 3

    Give the charge of the down quark.

    Model answer

    Minus one third of the elementary charge.

  4. 4

    Give the charge of the strange quark.

    Model answer

    Minus one third of the elementary charge, the same as the down quark.

  5. 5

    Give the quark composition of the proton and show that the charge is correct.

    Model answer

    The proton is uud, giving two thirds plus two thirds minus one third, which is plus one.

  6. 6

    Give the quark composition of the neutron and show that the charge is correct.

    Model answer

    The neutron is udd, giving two thirds minus one third minus one third, which is zero.

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