Calculadora de Comprimento de Onda
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
λ = v/f
About this calculator
This calculator determines the wavelength (λ) of a wave from its propagation speed (v) and frequency (f). The formula used is λ = v / f, where λ is in meters, v in meters per second, and f in hertz. It is an essential tool for students and professionals in physics, engineering, and related fields who need quick and accurate calculations.
Wavelength represents the distance between two consecutive points of the wave that are in phase, such as two peaks or two troughs. It is inversely related to frequency: the higher the frequency, the shorter the wavelength, for the same speed. The calculator is useful for electromagnetic waves (like light and radio) and mechanical waves (like sound in different media).
To use the calculator, enter the wave speed and frequency in the appropriate fields. Speed can be the speed of light in vacuum (approximately 3×10⁸ m/s) for electromagnetic waves or the speed of sound in air (about 343 m/s at 20°C) for sound waves. Frequency must be in hertz. The result is displayed in meters, with options to convert to other units like nanometers or centimeters.
Caution: ensure that the units of speed and frequency are compatible. For example, if speed is in km/s, convert to m/s before use. The formula assumes a homogeneous, non-dispersive medium, which may not hold for all real cases. For waves in dispersive media, wavelength can vary with frequency.
Frequently asked questions
What is wavelength?
Wavelength is the distance between two consecutive points of a wave that are in phase, such as two peaks or two troughs. It is usually denoted by the Greek letter λ and measured in meters.
How do I convert the result to nanometers?
To convert meters to nanometers, multiply the value in meters by 1,000,000,000 (10⁹). The calculator offers this conversion automatically.
Can I use this calculator for sound waves?
Yes, as long as you enter the speed of sound in the appropriate medium. In air at 20°C, the speed is about 343 m/s. For other media, adjust the speed as needed.
What happens if I enter zero frequency?
Frequency cannot be zero, as it would result in division by zero. Make sure the frequency is a positive number.
What is the difference between wavelength and period?
Wavelength is a measure of distance, while period is the time for one complete oscillation. They are related by the wave speed.