KCET2026PhysicsElectromagnetic Waves
What range of electromagnetic spectrum is considered as light?
Options
- A1 mm to 700 nm
- B400 nm to 1 nm
- C400 nm to 700 nm
- D1 nm to 10⁻³ nm
Correct answer
C. 400 nm to 700 nm
Step-by-step solution
The electromagnetic spectrum consists of various regions based on wavelength or frequency. The visible region, which is considered as light that can be detected by the human eye, ranges approximately from 400 nm to 700 nm. Wavelengths shorter than 400 nm fall into the ultraviolet, X-ray, and gamma-ray regions, while wavelengths longer than 700 nm fall into the infrared, microwave, and radio wave regions. Answer: 400 nm to 700 nm