Which type of electromagnetic wave has the shortest wavelength?

• A. Ultraviolet waves.
• B. X-rays.
• C. Microwaves.
• D. Radio waves.

Answer: (B)

X-rays are a type of electromagnetic wave characterized by their short wavelengths, which range from about 0.01 to 10 nanometers. This short wavelength allows X-rays to carry high energy and penetrate various materials, making them particularly useful in medical imaging and industrial applications.

In the electromagnetic spectrum, X-rays come after ultraviolet waves, which have longer wavelengths, and are followed by wavelengths that are significantly longer, such as those of microwaves and radio waves. The structure of the electromagnetic spectrum is arranged in order of decreasing wavelength and increasing frequency, which explains why X-rays hold the position of the shortest wavelength among the options presented.

Understanding the order of the electromagnetic spectrum is crucial, as it reflects the different properties and interactions of these waves with matter; shorter wavelengths like those of X-rays can ionize atoms, making them capable of causing biological damage and enabling their diagnostic applications in medicine.