Question

Reference Handbook at the end of your textbook.
Universal Nuclear Forces
Force
Acts on Which
Acts Over
Relative
Particles?
What Distance?
Strength
Strong nuclear
Weak nuclear

Answer 1

Here’s a concise reference-style summary you can use at the back of a textbook for the strong and weak nuclear forces.

Strong nuclear force
- Acts on which particles? Quarks and gluons (particles carrying color charge). Also produces a residual force that binds nucleons (protons and neutrons) in nuclei.
- Force carrier(s): gluons (massless, mediate the color force).
- Acts over what distance? Fundamental color force: confinement scale ≈ 1 fm (10^-15 m) (the force does not fall off simply with distance; it confines quarks). Residual strong (nuclear) force between nucleons: effective range ~1–2 fm.
- Relative strength (compared to the other fundamental forces): set to 1 (strongest). For rough comparison: electromagnetic ~10^-2, weak ~10^-6–10^-7, gravity ~10^-38.

Weak nuclear force
- Acts on which particles? All fermions (quarks and leptons) — responsible for flavor change (e.g., beta decay); neutrinos interact only via weak and gravity (and possibly other probes).
- Force carrier(s): W+ , W− , Z0 bosons (massive).
- Acts over what distance? Very short range due to massive mediators: ≈ 10^-18–10^-17 m (often quoted ≈ 0.001 fm).
- Relative strength: about 10^-6 to 10^-7 of the strong force (much weaker than electromagnetic and strong at low energies).

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