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Answer :
The question relates to the visible part of the electromagnetic spectrum, which is typically shown between frequencies of approximately [tex]4.3 \times 10^{14}[/tex] Hz and [tex]7.5 \times 10^{14}[/tex] Hz because these frequencies correspond to the visible light spectrum that humans can see.
Electromagnetic Spectrum Overview:
- The electromagnetic spectrum includes a wide range of electromagnetic waves with varying frequencies and wavelengths. These range from very low-frequency radio waves to very high-frequency gamma rays.
Visible Spectrum:
- Within this broad spectrum, the visible light spectrum is a small part that ranges in frequency from about [tex]4.3 \times 10^{14}[/tex] Hz (red light) to [tex]7.5 \times 10^{14}[/tex] Hz (violet light).
- This range is where human eyes are sensitive to light and can perceive different colors.
Why Those Limits?
- Frequencies below [tex]4.3 \times 10^{14}[/tex] Hz fall into the infrared range, which is not visible to the human eye.
- Frequencies above [tex]7.5 \times 10^{14}[/tex] Hz enter the ultraviolet range, which is also not visible to humans and can be harmful to living tissues.
Applications:
- Visible light is used in many applications, such as vision, photography, and illumination, because it is within the range where most natural sight works best.
Overall, the spectrum is only shown within this range in educational and illustrative contexts focusing on human-visible light to emphasize the part of the spectrum that is directly relevant to human experience. Beyond these limits, the electromagnetic spectrum continues with various other kinds of radiation that have important roles in scientific and technical applications.
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