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EM Spectrum Explorer: Wavelength & Frequency

See how radio waves, Wi-Fi, and light all obey c = λ × f at the speed of light.

Electromagnetic Wave Equation: c = λ × f · Speed of Light: c = 3.0 × 108 m/s ≈ 300,000 km/s
Click to pause/resume animation
Wavelength (λ) in m / cm / mm Frequency in Hz Speed: c = 3.0×108 m/s
Frequency (f) 2.0
100 kHz (Longwave)6 GHz (Wi-Fi)
Wavelength (λ) 2.0
← ShortLong →
Electromagnetic Spectrum Presets
c = λ × f
3.0×108 m/s = 150 m × 2.00 MHz
c = λ × f = 3.0×108 m/s (≈ 300,000 km/s) — always the same for all EM radiation
Radio Shortcut: λ (m) = 300 ÷ f (MHz)

Interactive Insights

Adjust the sliders or try a preset to explore how wavelength, frequency, and wave speed relate to each other.

Key Takeaways

  • c = λ × f — All electromagnetic waves travel at the speed of light (3.0 × 108 m/s).
  • Since c is constant, higher frequency always means shorter wavelength — the inverse relationship.
  • HF radio (λ ~30 m), FM (λ ~3 m) and Wi-Fi (λ ~12.5 cm) — same c, vastly different scales.
★ Current Focus: Drag the frequency slider to explore from Longwave (100 kHz, 3000 m) to Wi-Fi (6 GHz, 5 cm). c is always 3.0×108 m/s.