Multiple choice

Infra-red rays are_____ waves of _____ wavelength.

  1. electromagnetic, long

  2. mechanical, long

  3. mechanical, short

  4. electromagnetic, short
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Infrared rays are electromagnetic waves with wavelengths longer than visible light (700nm to 1mm). They are not mechanical waves like sound, which require a physical medium to propagate.

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