Wavelength comparison in electromagnetic spectrum

Steps:

• Visible light wavelengths range from 400 nm to 700 nm.
• 1000 times smaller wavelengths: divide by 1000, yielding 0.4 nm to 0.7 nm.
• X-rays occupy the 0.01 nm to 10 nm range, encompassing this scale.
• Other regions fall outside this shortened wavelength band.

Why D is correct:

• X-rays are defined by wavelengths of 0.01–10 nm, exactly 1000 times shorter than visible light's 400–700 nm per the electromagnetic spectrum classification.

Why the others are wrong:

• A. Infrared: wavelengths longer than visible (700 nm to 1 mm).
• B. Microwaves: wavelengths much longer (1 mm to 1 m).
• C. Ultraviolet: wavelengths shorter than visible but only 10–40 times (10–400 nm).

Final answer: D