Answer: Gamma rays.
- A Gamma rays
- B X-rays
- C Ultraviolet
- D Radio waves
Correct answer: A. Gamma rays
Explanation: The EM spectrum from lowest to highest frequency: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays. Gamma rays have the highest frequency (and energy) and shortest wavelength.
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.