Question

Define alpha particles and give examples of it ?

Answer 1

Hint:A particle is a small, localized entity to which physical or chemical properties including shape, density, and mass can be assigned. From subatomic particles like the electron to microscopic particles like atoms and molecules to macroscopic particles like powders, they differ greatly in size or quantity.

Complete answer:
The alpha decay of a radioactive nucleus produces an alpha particle. Because the nucleus is in an unstable state, a fragment of it is expelled, allowing the nucleus to stabilize. The alpha particle, which is made up of two protons and two neutrons, is expelled, and it is the nucleus of the helium atom.

Since helium is an inert and harmless gas, the particles are not harmful in and of themselves; the high speeds at which they are expelled from the nuclei are what makes them dangerous. They have enough energy to crack matter bonds or ionize atoms (knock electrons off) at these high speeds, which is particularly harmful to living cells.

Alpha particles have the unique property of not penetrating matter very deeply (unlike beta or gamma radiation). They come to a halt when they come into contact with paper! As a result, an external source of alpha particles (or alpha radiation as it is known, despite the fact that we now know they are particles) is not a major concern for humans.

Radionuclides including uranium-$238$, radium-$226$, and other members of the naturally occurring uranium, thorium, and actinium decay series, emit alpha particles, which can be found in varying quantities in virtually all rocks, soils, and water.

Note: It's worth noting that the fusion reaction only occurs when the experiment is turned on; whether it gets too hot or cold, or has too little or too much fuel, it will shut down. It's not like a naturally radioactive substance (such as Americium-$241$ or Polonium-$210$).