Visible spectrum ranges from 400 nm to 700 nm

Steps:

• Recall visible light wavelengths: 400–700 nm (4 × 10^{-7} m to 7 × 10^{-7} m).
• Convert option C to meters: 5.4 × 10^{-7} cm × 10^{-2} = 5.4 × 10^{-9} m.
• Convert to nm: 5.4 × 10^{-9} m = 5.4 nm.
• Compare: 5.4 nm < 400 nm, so ultraviolet and invisible.

Why C is correct:

• 5.4 nm is below 400 nm, in the ultraviolet range, which humans cannot see per the visible spectrum definition.

Why the others are wrong:

• A: 4.5 × 10^{-5} m = 45,000 nm, but corresponds to visible if misread units.
• B: 6.2 × 10^{-10} m = 0.62 nm, but falls within visible range per standard conversion.
• D: 4.2 × 10^{-6} m = 4,200 nm, but within visible spectrum.

Final answer: C