Multiple choice

Electromagnetic radiation are emitted by which of the following?

  1. Only by radio and TV antenna

  2. Only by bodies at temperature higher than surrounding

  3. Only by red hot bodies

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

According to the laws of thermal radiation, all bodies with a temperature above absolute zero (0 Kelvin) emit electromagnetic radiation. While hot bodies emit more intensely, every object continuously emits and absorbs radiation.

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