Cathode-rays are not electromagnetic in nature.

Explanation:
- Electromagnetic waves are waves that consist of oscillating electric and magnetic fields. They are produced by the acceleration of charged particles and can travel through a vacuum or a medium.
- Cathode-rays are streams of electrons that are emitted from the cathode (negative electrode) of a vacuum tube when a high voltage is applied across it. They were first discovered by J.J. Thomson in the late 19th century.
- Cathode-rays are not electromagnetic waves because they do not consist of oscillating electric and magnetic fields. Instead, they are streams of charged particles (electrons) that have been accelerated by the electric field within the vacuum tube.
- Cathode-rays can be deflected by electric and magnetic fields, but they do not possess the characteristics of electromagnetic waves such as wavelength, frequency, and speed of propagation.
- Cathode-rays have been used in various applications, such as in cathode-ray tube (CRT) displays and electron microscopes. In CRT displays, the cathode-rays are focused and directed onto a phosphor-coated screen, causing the phosphors to emit light and create an image.
- X-rays and gamma-rays, on the other hand, are examples of electromagnetic waves. X-rays have shorter wavelengths and higher frequencies than visible light, and they can penetrate through materials. Gamma-rays have even shorter wavelengths and higher frequencies than X-rays, and they are often emitted during nuclear reactions or radioactive decay.
- Infrared rays are also examples of electromagnetic waves. They have longer wavelengths and lower frequencies than visible light, and they are commonly used in heat sensing and thermal imaging applications.

In summary, cathode-rays are not electromagnetic in nature because they consist of streams of charged particles (electrons) rather than oscillating electric and magnetic fields.