Answer: Microwaves.
- A Gamma rays
- B X-rays
- C Infrared
- D Microwaves
Correct answer: D. Microwaves
Explanation: Microwaves have suitable frequencies that pass through the atmosphere, so they are used in radar, satellite links and mobile communication.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.