Which radiation is most likely to be detected using a photodiode?

A photodiode is a semiconductor device that converts light into an electrical current. It is sensitive to various wavelengths of light and is often used to detect a range of electromagnetic radiation, particularly in the infrared spectrum.

Infrared radiation has longer wavelengths that fall within the sensitivity range of photodiodes. When infrared light strikes the photodiode, it causes charge carriers to be generated, which leads to a measurable electrical current. This property makes photodiodes highly effective for detecting infrared radiation, commonly used in applications like remote controls, infrared communication, and thermal imaging.

In contrast, other types of radiation such as gamma rays, X-rays, and ultraviolet have different interactions with materials and often require specialized detectors. While some photodiodes can be designed to detect X-rays or UV light with specific designs or coatings, they are not as commonly employed for these purposes as they are for infrared radiation. The design and application of the photodiode make detecting infrared the most straightforward and efficient option compared to the other types of radiation listed.