Herschel used the prefix “infra” to name invisible radiation because it means
A “inside,” since it was detected inside the known color spectrum.
B “above,” since it was detected beyond the red domain of the known color spectrum.
C “outside,” since it was detected outside the known color spectrum.
D “below,” since it was detected beyond the red domain of the known color spectrum.
The correct answer is D “below,” since it was detected beyond the red domain of the known color spectrum.
Herschel used the term “infrared” to refer to radiation that is beyond the visible red light on the spectrum, meaning it has lower frequencies than red light. The prefix “infra-” translates to “below” in Latin, indicating that it is below the visible range. If you have any more questions or need further clarification, feel free to ask!