X-ray

X-rays are a form of electromagnetic radiation that is mainly used for medical imaging and treating cancer. They can see through skin and reveal images of the bones beneath it. X-rays are very useful and can do things from showing images of extremely small biological cells and the structural components of materials like cement to killing cancer cells.

There are two different categories of x-rays, hard x-rays and soft x-rays. Soft x-rays are the lower energy x-rays and have wavelengths of about 10 nanometers. Hard x-rays, the higher energy x-rays, have wavelengths of about 100 picometers. X-rays are at the high energy end of the electromagnetic spectrum, and only gamma rays carry more energy.