Question

Find the wavelength of radio waves of frequency 200kHz

Answer 1

For any wave, Wavelength = (speed) / (frequency)

For radio waves, Speed = about 3x10⁸ meters per sec ("speed of light")

So Wavelength = (3 x 10⁸ m/s) / (200 x 10³ /sec) = 1,500 meters

Answer 2

`\lambda = (c)/(f)`
λ - wavelength, c - the speed of light, f - frequency


`f=200 \ kHz= 200 000 \ Hz \\ \\ \lambda=(300 000 \ [(km)/(s)])/(200 000 \ [Hz])=(3)/(2)=1.5 \ [km]`

The wavelength of these waves is 1.5 km.