Stable and Unstable Nuclei 0.0 / 5 ? PhysicsParticle physicsASAQA Created by: Mr_MackintoastCreated on: 28-02-18 16:46 Forces within a nucleus You need a repulsive force that pushes protons apart at long distance (electrostatic force) over 3fm You need an attractive force that pulls nucleons together at a small distance (below 3fm) You need a repusive force at very short distances to stop the nucleus from collapsing (strong force) below 0.5fm 1fm = 1 femtometre (10^-15 m) 1 of 3 Recap of nuclear decay Alpha Decay- When two protons and two neutrons are emitted as a single particle from the nucleus Beta Decay- When an electron is emitted from the nucleus when a neutron turns into a proton <- Alpha Decay 2 of 3 Recap of nuclear decay <- Beta Plus Decay Gamma Decay- Excited nucleus after alpha or beta decay gives off electromagnetic radiation (y radiation) 3 of 3
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