alleryWhich of these were only barely established at the time Maxwell was working?
AUltrasonic and infrasonic
BUltramarine and infrablue
CUltralight and infrared
DUltraviolet and infrared
Answer & Solution
Correct answer: D. Ultraviolet and infrared
1. Visible light was of course long known.
2. The invisible neighbours of the visible band were newer.
3. The existence of ultraviolet and infrared waves was barely established.
4. X-rays and gamma rays came later still.
_Source: syllabus Physics Part I, Ch 8 'Electromagnetic Waves'_
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