Answer: Hertz.
- A Hertz
- B Maxwell
- C Faraday
- D Oersted
Correct answer: A. Hertz
Explanation: Maxwell predicted EM waves theoretically, but Heinrich Hertz first produced and detected them experimentally using a spark-gap apparatus.
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.