The speed of all electromagnetic waves is 3.00 × 108 meters per second. What is the wavelength of an X-ray with a frequency of 1.18 × 1018 Hz?

Use the wave equation c = fλ, so the wavelength is λ = c ÷ f. Substituting the values gives (3.00 × 10⁸ m/s) ÷ (1.18 × 10¹⁸ Hz) = 2.54 × 10⁻¹⁰ m. Therefore, the correct choice is 2.54 × 10⁻¹⁰ meters.

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