Electromagnetic spectrum order by frequency and wavelength

Steps:

• Order EM waves by increasing frequency (decreasing wavelength): radio, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays.
• Use relation c = fλ, where frequency f increases as wavelength λ decreases.
• Compare each option to this spectrum order.
• Identify the statement matching the order.

Why C is correct:

• Ultraviolet waves follow visible light in the spectrum, so they have shorter wavelengths and thus higher frequencies per c = fλ.

Why the others are wrong:

• A: Infrared precedes visible light, so it has longer wavelengths.
• B: Microwaves follow radio waves, so they have shorter wavelengths.
• D: Gamma rays follow X-rays, so they have higher frequencies.

Final answer: C