Enter your Wave Velocity and Wavelength (or known Frequency) into this Frequency Calculator, then select your medium, units, and calculation type to find the missing value — plus get your result in Scientific Notation and see the corresponding Photon Energy in eV.
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Scientific Notation
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Photon Energy (eV)
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To calculate frequency, use the formula f = v/λ where f is frequency, v is wave velocity, and λ is wavelength. Simply divide the wave velocity by the wavelength to get the frequency in Hz.
Frequency and wavelength are inversely proportional - as frequency increases, wavelength decreases. This relationship is described by the equation c = fλ, where c is the speed of light (constant).
Use the formula λ = v/f where λ is wavelength, v is wave velocity, and f is frequency. Divide the wave velocity by the frequency to calculate the wavelength.
Visible light frequencies range from approximately 430 THz (red light, ~700 nm) to 750 THz (violet light, ~400 nm). Green light has a frequency around 545 THz at 550 nm wavelength.
Electromagnetic waves (like light) can travel through vacuum at the speed of light (3×10⁸ m/s), while sound waves require a medium and travel much slower (343 m/s in air at 20°C).
Photon energy is calculated using E = hf, where h is Planck's constant (6.626×10⁻³⁴ J·s) and f is frequency. For convenience, energy can also be expressed in electron volts (eV).
5G operates across multiple frequency bands: low-band (600 MHz - 1 GHz), mid-band (1-6 GHz), and high-band millimeter wave (24-100 GHz). The specific frequency depends on the carrier and location.
Violet light has the highest frequency in the visible spectrum, at approximately 750 THz with a wavelength around 400 nm. Beyond violet, ultraviolet light has even higher frequencies.