Electromagnetic spectrum ordered by wavelength

Steps:

• Recall that wavelength increases as frequency decreases in the electromagnetic spectrum.
• Gamma rays have the shortest wavelengths, followed by X-rays.
• Visible light has longer wavelengths than X-rays but shorter than microwaves.
• Microwaves have the longest wavelengths among these regions.

Why B is correct:

• It lists the regions from shortest to longest wavelength, matching the spectrum's order: gamma rays (highest energy, shortest λ) to microwaves (lowest energy, longest λ).

Why the others are wrong:

• A starts with longest wavelength (microwaves) and ends with shortest (gamma rays), reversing the order.
• C is identical to B but listed as a separate choice, likely a duplication error.
• D incorrectly places X-rays before gamma rays, ignoring gamma rays' shorter wavelengths.

Final answer: B