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The Determination of the Velocity of Radio Waves

Part of the Series : Experiment: Physics
DVD Price: $49.95



The wavelengths and frequencies of radio waves are measured from the electric and magnetic fields generated from standing electromagnetic waves in an open-circuited transmission line. The distance between successive maxima in the electric and magnetic fields is one-half the wavelength of the original radiation. These maxima are measured along the transmission line with a vertical antenna on a receiver for the electric field and with a loop antenna for the magnetic field. Students record the distances between the maxima in the receiver signal. The frequency is timed by feeding the radio wave signal from the oscillator to a frequency meter which uses a piezoelectric crystal as the timer. Students can calculate the velocity of the radio waves (the product of the wavelength and the frequency) and compare this with the velocity of light measured in Program 1. (15 minutes)

Length: 15 minutes

Item#: BVL1073

Copyright date: ©1990

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Only available in USA and Canada.