The ability of electromagnetic waves to penetrate through objects or interact with matter depends on several factors, including their wavelength and energy. The behavior you described can be explained by the interaction of different electromagnetic waves with matter.
X-rays, which have short wavelengths and high energies, can penetrate through the body because they have sufficient energy to pass through tissues. However, they can also interact with dense materials, such as bones, and get absorbed or scattered, which is why they are commonly used in medical imaging.
On the other hand, radio waves have much longer wavelengths and lower energies compared to X-rays. These longer wavelengths allow them to pass through many obstacles, including buildings, walls, and debris. They are less likely to interact with the matter and get absorbed or scattered. This property of radio waves makes them suitable for long-range communication and enables signals to reach us even through obstacles.
The visible light spectrum, which includes different colors, has wavelengths that are shorter than radio waves but longer than X-rays. Visible light interacts with matter in various ways. When it encounters opaque objects, such as walls or debris, it can get absorbed or reflected, preventing it from passing through. This is why we cannot see objects on the other side of a wall. However, transparent materials, like glass, allow visible light to pass through with minimal absorption or scattering, which is why we can see through them.
In summary, the ability of electromagnetic waves to penetrate through objects or interact with matter depends on their wavelength, energy, and the properties of the materials they encounter. X-rays, with their high energy, can penetrate the body but can be absorbed by dense materials. Radio waves, with their long wavelengths, can pass through obstacles relatively easily. Visible light interacts with matter, either being absorbed or reflected, depending on the characteristics of the materials it encounters.