Question

The most penetrating radiation out of the following are

• A. $\beta -rays$
• B. $\gamma-rays$
• C. $X-rays$
• D. $\alpha-rays$

Answer 1

The Correct Option is B

To determine which type of radiation is the most penetrating, we need to understand the nature of different types of radiation.

1. $\alpha$-rays$ (Alpha rays): These are heavy, positively charged particles with low penetration capability. They can be stopped by a sheet of paper or by human skin.
2. $\beta$-rays$ (Beta rays): These are fast-moving electrons or positrons. They have greater penetration than alpha particles but can be stopped by a few millimeters of plastic or a thin sheet of metal.
3. $X-rays$ (X-rays): These are electromagnetic waves with a higher penetration power than alpha and beta particles. They can pass through soft tissues but are absorbed by denser materials like bones and metals.
4. $\gamma$-rays$ (Gamma rays): These are high-energy electromagnetic waves, similar to X-rays but with even higher energy. They can penetrate most materials to a significant extent and require dense materials like lead or thick concrete for shielding.

Among these options, $\gamma$-rays$ are the most penetrating radiation due to their high energy and electromagnetic nature. They can pass through several centimeters of lead, making them the most permeable among the types listed.

Hence, the correct answer is $\gamma$-rays$.