Electromagnetic spectrum ordered by increasing wavelength

Steps:

• Recall the electromagnetic spectrum arranges waves from shortest to longest wavelength: gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, radio waves.
• Identify the given regions: x-rays (shortest wavelength here), ultraviolet, infrared, microwaves (longest).
• Compare options to this sequence, checking for ascending order.
• Select the option matching x-rays → ultraviolet → infrared → microwaves.

Why D is correct:

• D follows the standard EM spectrum definition, where wavelength increases from x-rays (0.01–10 nm) to ultraviolet (10–400 nm), infrared (700 nm–1 mm), and microwaves (1 mm–1 m).

Why the others are wrong:

• A starts with infrared (longer waves) before shorter ultraviolet and x-rays, reversing order.
• B places microwaves (longest) first, then jumps to short x-rays, disrupting sequence.
• C begins with microwaves (longest) and ends with x-rays (shortest), fully inverted.

Final answer: D