BINDING ENERGY CLASS 12 PHYSICS | IMPORTANT TOPICS OF 12 PHYSICS | CBSE | ISCE BOARDS

In physics and chemistry, binding energy is the smallest amount of energy required to remove a particle from a system of particles or to disassemble a system of particles into individual parts.[1] In the former meaning the term is predominantly used in condensed matter physics, atomic physics, and chemistry, whereas in nuclear physics the term separation energy is used. A bound system is typically at a lower energy level than its unbound constituents. According to relativity theory, a ΔE decrease in the total energy of a system is accompanied by a decrease Δm in the total mass, where Δmc2 = ΔE.[2]
Calculate mass defect, binding energy and binding energy per nucleon for a lithium nucleus (_3Li^7) taking its mass = 7.000000 \text{ a.m.u.}, Mass of proton = 1.007825 \text{ a.m.u.} and mass of neutron = 1.008665 \text{ a.m.u.} Take 1 \text{ a.m.u} = 931.5 \text{ MeV}.
The atomic masses of lithium, hydrogen and helium are: 7.016 u, 1.008 u and 4.004 u resp. Find the initial energy of each \alpha-particle. Take 1 amu = 931 MeV.

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