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Correct Answer

B Delta

Model Answer

If a material containing unstable nuclei, it is considered radioactive in nature. Alpha, Beta, and Gamma are the radioactive particles.
Alpha particles are helium nuclei (2 p, 2 n)
Beta particles are speedy electrons
Gamma radiation is a stream of photons
The penetrating power of alpha rays, beta rays, and gamma rays varies greatly.
Alpha particles can be blocked by a few pieces of paper.
Beta particles pass through paper but are stopped by aluminium foil.
Gamma rays are the most difficult to stop and require concrete, lead, or other heavy shielding to block them.
Delta particles, also known as Delta baryons, on the other hand are a family of subatomic particles made up of quarks, similar to protons and neutrons.