9702 · 23.1
Mass defect and nuclear binding energy
Dive into the fascinating world of nuclear physics, where mass isn't always conserved! Discover the **mass defect**, a tiny difference in mass that reveals the powerful **nuclear binding energy** holding atomic nuclei together. We'll explore how Einstein's famous equation, $E=mc^2$, unlocks the secrets of nuclear stability, fusion, and fission. This pilot aligns with **Senpai Corner** A Level notes (2025–2027) for topic **23.1**.
Need to know
What you need to know
- **Atomic Mass Unit (u):** Defined as 1/12th the mass of a neutral carbon-12 atom. $1 \text{ u} = 1.661 \times 10^{-27} \text{ kg}$. It's a convenient unit for the tiny masses of subatomic particles.
- **Electronvolt (eV):** The energy gained by an electron accelerated through a potential difference of 1 volt. $1 \text{ eV} = 1.60 \times 10^{-19} \text{ J}$. Nuclear energies are often expressed in **Mega-electronvolts (MeV)**, where $1 \text{ MeV} = 10^6 \text{ eV}$.
- **Energy-Mass Conversion:** Using E=mc², the energy equivalent of 1 atomic mass unit can be calculated. It is a very useful conversion factor: $1 \text{ u} \approx 931.5 \text{ MeV}$.
Explanation
Mass defect and nuclear binding energy
- **Atomic Mass Unit (u):** Defined as 1/12th the mass of a neutral carbon-12 atom. $1 \text{ u} = 1.661 \times 10^{-27} \text{ kg}$. It's a convenient unit for the tiny masses of subatomic particles.
- **Electronvolt (eV):** The energy gained by an electron accelerated through a potential difference of 1 volt. $1 \text{ eV} = 1.60 \times 10^{-19} \text{ J}$. Nuclear energies are often expressed in **Mega-electronvolts (MeV)**, where $1 \text{ MeV} = 10^6 \text{ eV}$.
- **Energy-Mass Conversion:** Using E=mc², the energy equivalent of 1 atomic mass unit can be calculated. It is a very useful conversion factor: $1 \text{ u} \approx 931.5 \text{ MeV}$.