Answer: Ultraviolet radiation.
- A Ultraviolet radiation
- B Infrared radiation
- C Radio waves
- D Visible light
Correct answer: A. Ultraviolet radiation
Explanation: The ozone layer (stratosphere, 15-35 km altitude) absorbs harmful ultraviolet radiation, particularly UVC (most harmful) and much of UVB. Depletion of ozone (by CFCs) allows more UV to reach Earth.
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.