In order of longest wavelength to shortest wavelength, which of the following is the correct order of electromagnetic radiation?

• A. X-rays, visible light, microwaves
• B. Microwaves, visible light, x-rays
• C. Visible light, microwaves, x-rays
• D. X-rays, microwaves, visible light

Answer: (B)

The correct order of electromagnetic radiation from longest wavelength to shortest wavelength is, indeed, microwaves, visible light, and then x-rays.

Microwaves have longer wavelengths, typically ranging from about one millimeter to one meter. This characteristic makes them effective for applications like cooking and certain forms of communication.

Visible light occupies the middle range of the electromagnetic spectrum and ranges from about 380 nanometers to about 750 nanometers. This is the portion of the spectrum that the human eye can detect.

X-rays have significantly shorter wavelengths, ranging from about 0.01 nanometers to 10 nanometers. Their short wavelengths allow them to penetrate various materials, which is fundamental in radiography, as they can pass through soft tissue but are absorbed by denser materials like bones.

Understanding the arrangement of these types of radiation according to wavelength provides insight into their properties and applications. This is crucial for fields such as medical imaging and communications.