What is the formula for converting frequency to approximate wavelength in meters?
Why All radio waves travel at the speed of light, about 300,000,000 meters per second, and wavelength equals that speed divided by frequency. Writing the speed as 300 million and the frequency in millions of hertz (MHz) cancels the millions, leaving the handy shortcut wavelength (m) = 300 / frequency (MHz). Check it: 300 / 146 MHz is about 2 meters, which is exactly what hams call the 2 meter band.
Watch out The choices that divide a frequency by 300 have the ratio upside down, and they would make higher frequencies give longer wavelengths, which is backward; wavelength and frequency are inversely related.
300 over MHz. 300/146 = 2 m, 300/440 = 0.7 m. Big frequency, small wavelength.