Visible light is only one narrow band within a much bigger family of radiation. What is that family called?
ASound radiation, of which visible light is one loud band
BElectromagnetic radiation, of which visible light is one narrow band
CNuclear radiation, of which visible light is one weak type
DThermal radiation, of which visible light is one hot type
Answer & Solution
Correct answer: B. Electromagnetic radiation, of which visible light is one narrow band
1. The word light usually means visible light, but visible light is not the only form of EMR.
2. EMR stands for electromagnetic radiation, a broad family that includes radio waves, microwaves, infrared, ultraviolet, X-rays and gamma rays alongside visible light.
3. Visible light is therefore a narrow band inside that wider family, not a separate kind of energy.
4. Sound needs a medium to travel through and is not electromagnetic at all, which rules out the sound option.
_Source: OpenStax Physics (CC BY 4.0), Ch 15 "Light", section 15.1 The Electromagnetic Spectrum_
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