Radiation with maximum penetration power is :

Question

Accepted Answer

Radiation with maximum penetration power is γ-rays.

1. **Explanation for Option 2 (γ-rays):**
   - γ-rays, or gamma rays, are a form of electromagnetic radiation with the highest energy and shortest wavelength in the electromagnetic spectrum. Due to their high energy, γ-rays have the greatest penetration power among all types of electromagnetic radiation. They can penetrate most materials, including human tissue, and require dense materials like lead or several centimeters of concrete to be effectively blocked. This high penetration power makes γ-rays particularly useful in medical applications, such as cancer treatment, and in industrial settings for non-destructive testing.

2. **Explanation for why other options are incorrect:**

- **Option 1 (Infrared radiation):**
     - Infrared radiation has much lower energy compared to γ-rays. It is primarily associated with heat and is easily absorbed by most materials, including the atmosphere and human skin. Its penetration power is limited, making it unsuitable for applications requiring deep penetration.

- **Option 3 (Ultraviolet radiation):**
     - Ultraviolet (UV) radiation has higher energy than infrared but significantly less than γ-rays. While UV radiation can penetrate the skin and cause damage, it is largely absorbed by the Earth's ozone layer and does not have the deep penetration capability of γ-rays. It is often used for sterilization and disinfection but cannot penetrate materials deeply.

- **Option 4 (X-rays):**
     - X-rays have more penetration power than infrared and ultraviolet radiation but less than γ-rays. They are commonly used in medical imaging because they can penetrate soft tissues but are absorbed by denser materials like bones. However, γ-rays have even higher energy and penetration power than X-rays, making them the most penetrating form of electromagnetic radiation.

In conclusion, γ-rays are the correct answer because they possess the highest energy and penetration power among the options provided, allowing them to penetrate materials more effectively than infrared, ultraviolet, or X-rays.