Wavelength is the distance between repeating points on a wave — crest to crest, for example.
About this calculator
Wavelength is the distance between repeating points on a wave — crest to crest, for example. This calculator uses λ = v/f with wave speed in m/s and frequency in Hz.
Example: sound at 340 m/s and 440 Hz (concert A) has λ ≈ 0.773 m. Light at 3 × 10⁸ m/s and 5 × 10¹⁴ Hz has λ ≈ 600 nm (visible orange-red).
Wave speed links to motion: compare with the [[speed-distance-time]] calculator for travel time over one wavelength. Energy of photons connects to the [[energy-mass]] relation at advanced levels. For matter waves, combine with results from modern physics courses. Oscillating springs use the [[hookes-law]] calculator; standing waves in strings build on the same λ = v/f relationship.
Common uses
- Sound and music wavelength problems
- Electromagnetic spectrum homework (radio to visible)
- Antenna and radio frequency length estimates
- Class 11 waves and oscillations chapter
- Checking lab measurements with oscilloscopes and speakers
Frequently asked questions
What is the wavelength of 440 Hz sound at 340 m/s?
λ = v/f = 340 / 440 ≈ 0.773 m (77.3 cm). Enter velocity 340 and frequency 440. The calculator also shows period T ≈ 0.00227 s.
How do you calculate wavelength of light?
Use v = c ≈ 3 × 10⁸ m/s for vacuum. Example: red light at 4.5 × 10¹⁴ Hz has λ = c/f ≈ 667 nm. Enter v and f in SI units.
What happens to wavelength if frequency doubles?
λ halves when v is fixed. Higher pitch (higher f) means shorter wavelength for the same medium.
What is the period if frequency is 50 Hz?
T = 1/f = 0.02 s. This calculator shows period alongside wavelength for each result.