Electromagnetic Wavelength Calculator Formula
Understand the math behind the electromagnetic wavelength calculator. Each variable explained with a worked example.
Formulas Used
Wavelength
wavelength = 299792458 / frequencyWavelength (cm)
wavelength_cm = 29979245800 / frequencyVariables
| Variable | Description | Default |
|---|---|---|
frequency | Frequency(Hz) | 100000000 |
How It Works
EM Wavelength
All electromagnetic waves travel at the speed of light in vacuum.
Formula
lambda = c / f
where c = 299,792,458 m/s. This applies to radio waves, microwaves, infrared, visible light, UV, X-rays, and gamma rays.
Worked Example
An FM radio station broadcasting at 100 MHz.
- 01lambda = c / f
- 02lambda = 299792458 / 100000000
- 03lambda = 2.998 m
Frequently Asked Questions
What is the electromagnetic spectrum?
The full range of EM wavelengths: radio (km) > microwave (cm) > infrared (μm) > visible (400-700 nm) > UV (nm) > X-ray (pm) > gamma (fm).
Do all EM waves travel at the same speed?
In vacuum, yes. In a medium, different wavelengths may travel at slightly different speeds (dispersion).
What frequency is visible light?
Visible light spans roughly 430 THz (red) to 770 THz (violet), corresponding to wavelengths of 400-700 nm.
Learn More
Guide
Understanding the Electromagnetic Spectrum
A complete guide to the electromagnetic spectrum. Learn about radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, including their wavelengths, frequencies, and applications.
Ready to run the numbers?
Open Electromagnetic Wavelength Calculator