Answer: Between infrared and ultraviolet (wavelengths 400-700 nm).
- A Between infrared and ultraviolet (wavelengths 400-700 nm)
- B Between radio waves and microwaves in the long-wavelength region
- C Between ultraviolet and X-rays in the short-wavelength region
- D Between X-rays and gamma rays at the highest-energy end
Correct answer: A. Between infrared and ultraviolet (wavelengths 400-700 nm)
Explanation: Visible light occupies a narrow band: violet ≈400 nm to red ≈700 nm. Below violet is UV; above red is infrared. The visible spectrum is a tiny part of the EM spectrum.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.