Which of the following is NOT a fundamental property of X-rays?

The fundamental properties of X-rays include characteristics that are essential to their nature and function in medical imaging. The option stating that X-rays can be easily captured without any device is not accurate because imaging and detection of X-rays require specialized equipment. This includes devices such as film-based systems or digital detectors that are specifically designed to capture the ionizing radiation emitted by X-rays.

In contrast, X-rays possess the other properties mentioned. They cannot be seen or felt by the human senses, which is crucial for their function in medical diagnostics, as it allows them to pass through body tissues without being detected by the average person. Additionally, X-rays travel at the speed of light, a property fundamental to their application in imaging as it allows for quick assessments. Furthermore, X-rays have the capability to ionize matter, meaning they can remove tightly bound electrons from atoms, which is an essential aspect of how they interact with biological tissues, making them useful for diagnostic purposes.

Understanding these properties clarifies the role of X-rays in medical imaging and highlights why specialized devices are necessary for their detection and capture.