Which type of radiation designates a part of the electromagnetic spectrum with frequencies approximately from 300 GHz to 3 kHz, or equivalent, wavelengths approximately from 1 mm to 100km?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Radio waves.
- Radio waves have the lowest frequencies of all types of EMR, and their photons carry the least amount of energy.
- Radio waves are a type of electromagnetic (EM) radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
- They have have frequencies from 300 GHz to as low as 3 kHz, and corresponding wavelengths from 1 millimeter to 100 kilometers.