Answer: Microwaves (cm-wavelength).
- A Microwaves (cm-wavelength)
- B AM radio waves overall
- C Gamma rays in most cases
- D Infrared under typical conditions
Correct answer: A. Microwaves (cm-wavelength)
Explanation: RADAR uses microwave pulses. They are reflected by metal objects (aircraft, ships). The time delay between sending and receiving gives the distance. Weather RADAR detects water droplets.
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.