Multiple choice general knowledge science & technology

We have two lamps: one is broken (A), the other is glowing (B). Which of these lamps is emitting electromagnetic radiation?

  1. Lamp A

  2. Lamp B

  3. Both

  4. Neither
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All objects with temperature above absolute zero emit electromagnetic radiation (thermal radiation). Lamp B (glowing) emits visible light plus thermal radiation. Lamp A (broken but still at room temperature) still emits thermal radiation in the infrared spectrum. Therefore, both lamps emit electromagnetic radiation.

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