Question

Which of the following radiations of electromagnetic waves has the highest wavelength ?

• A. IR- Rays
• B. X- Rays
• C. Microwave
• D. UV- Rays

Answer 1

The Correct Option is C

The electromagnetic spectrum encompasses a wide range of radiation types, each characterized by its wavelength and frequency. The relationship between wavelength (\(\lambda\)) and frequency (\(f\)) is given by \(c = \lambda f\), where \(c\) is the speed of light. This means that radiation with a higher wavelength has a lower frequency, and vice versa.

Considering the common types of electromagnetic radiation: 

• Radio waves
• Microwaves
• Infrared radiation
• Visible light
• Ultraviolet radiation
• X-rays
• Gamma rays

The order of these radiations from longest to shortest wavelength is:

1. Radio waves
2. Microwaves
3. Infrared
4. Visible Light
5. Ultraviolet
6. X-Rays
7. Gamma Rays

Therefore, among the options typically presented, microwaves have a higher wavelength than other radiation types such as infrared, visible light, ultraviolet, X-rays and Gamma rays. Radio waves have the highest wavelength in the entire EM spectrum.

Thus, the electromagnetic radiation with the highest wavelength from the expected choices is:

Microwave