Leptons and the quark model

Overview

Recall questions on the electron and neutrino as leptons, and on the simple quark model of hadrons.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   Name the antiparticle of the neutrino.

   Model answer

   The antineutrino.

2. 2

   Define leptons in terms of the fundamental forces they experience.

   Model answer

   Leptons are particles that experience the weak nuclear force but not the strong nuclear force.

3. 3

   Why are electrons classified as leptons rather than hadrons?

   Model answer

   Electrons experience the weak nuclear force but do not experience the strong nuclear force, which is the defining characteristic of leptons.

4. 4

   To which particle family does the neutrino belong?

   Model answer

   Leptons.

5. 5

   Which quarks and antiquarks are used in the simple quark model to describe hadrons?

   Model answer

   Up, down and strange quarks, along with their corresponding antiquarks (anti-up, anti-down and anti-strange).

6. 6

   What is the electric charge of a strange quark?

   Model answer

   The strange quark has a charge of −⅓e (negative one-third of the elementary charge).

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