Question

Determine the wavelength at the following frequencies in metric and English units:

1) 850MHz, free space

2) 430MHz, Teflon

3) 250kHz, air

4) 20kHz (RS-232 data transmission), air

5) 450 kHz - 1.5MHz AM radio transmission, air

Answer 1

1) wavelength = C / f = (3 * 10⁸ )/ (850 * 10⁶) = 0.3529 meter

2) wavelength = C / (f * (dielectric constant of teflon)^0.5 )

=(3 * 10⁸) / (430 * 10⁶ * (2.1)^0.5 ) = 0.4814 meter

3)  wavelength = C / f = (3 * 10⁸ ) / (250 * 10³) = 1200 meter = 1.2 Km

4) wavelength = C / f = (3 * 10⁸ ) / (20 * 10³) = 15000 meter = 15Km

5) wavelength = C / f = (3 * 10⁸ ) / (450 * 10³) = 666.67 meter

wavelength = C / f = (3 * 10⁸ ) / (1.5 * 10⁶) = 200 meter

200 m to 666.67 m