7000 millimetres about 23 feet
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If you uncoil all of a regular french horn's tubing, in total it would be 12 feet long!
.932 of a mile
How far is 100 metres
Radio waves do not emit visible light. Only light with wavelengths of roughly 4*10^-7 to 7*10^-7 meters are visible.
The frequency, or number of cycles per second is measured, then divide the speed of light in meters per second (299,792,458) by frequency to get wavelength in meters. Example: 7 Mhz = 7,000,000 hz 299792458 / 7000000 = 42.8 meters.