To find the alpha particle subtract the atomic masses of X and Y and divide it with 4 and for beta particles use the formula Atomic no of X= Atomic no. of Y + 2α-β.
Atomic number of an element decreases by 2, when an alpha particle is emitted out. 2. Atomic number of the element increases by 1, when a beta particle is emitted out.
Therefore, one α - particle is emitted.
Alpha particles are relatively slow and heavy compared with other forms of nuclear radiation. The particles travel at 5 to 7 % of the speed of light or 20,000,000 metres per second and has a mass approximately equivalent to 4 protons.
The emission of an alpha particle from a nucleus reduces the mass number of the nucleus by 4 and the atomic number by 2.
When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4. the atomic number decreases by 2.
Listen to pronunciation. (AL-fuh ee-MIH-ter RAY-dee-AY-shun THAYR-uh-pee) Therapy that uses a radioactive substance that gives off a type of high-energy radiation called an alpha-particle to kill cancer cells.
On emission of one alpha particle, the mass number decreases by 4. With the emission of an alpha particle, the atomic number decreases by 2 but when a β-particle is emitted, the atomic number increases by 1. No. of α-particles emitted = 8.
Therefore, one α-particle is emitted.
about 5 MeVDue to the mechanism of their production in standard alpha radioactive decay, alpha particles generally have a kinetic energy of about 5 MeV, and a velocity in the vicinity of 4% of the speed of light.
Alpha ParticleAlpha ParticleValueAlpha Particle mass in Kg6.644657230(82) × 10-27 KgMass of alpha particle in amu4.001506179127(63) uMass of alpha particle in eV3.727379378(23) GeV/c2Alpha particle mass number43 more rows