Multiple choice

Electromagnetic radiation is emitted

  1. only by T.V & radio antenna

  2. only by bodies at higher temp. than surrounding

  3. only by bodies at lower temp. than surrounding

  4. by all bodies
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All objects with a temperature above absolute zero (0 Kelvin) emit electromagnetic radiation. This is due to the thermal motion of charged particles within the atoms of the material.

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