| |
KF5JRV > TECH 31.01.17 14:21l 14 Lines 1485 Bytes #999 (0) @ WW
BID : 9659_KF5JRV
Read: GUEST
Subj: Radio Waves
Path: IW8PGT<IZ3LSV<IK6ZDE<F1OYP<KQ0I<N3IP<NS2B<KF5JRV
Sent: 170131/1215Z 9659@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Radio Frequency and Wavelength Ranges
Radio waves have a wide range of applications, including communication during emergency rescues (transistor and shortwave radios), international broadcasts (satellites), and cooking food (microwaves). A radio wave is described by its wavelength, the distance from one crest to the next, or its frequency, the number of crests that move past a point in one second. Wavelengths of radio waves range from 100,000 m (270,000 ft) to 1 mm (.004 in). Frequencies range from 3 kilohertz to 300 gigahertz.
· Heinrich Hertz 1857-1894 proves Maxwell's theory that electricity can travel through space in waves. He went on to show that these waves shared the same physical properties as light.
· Hertz was born in Hamburg, Germany and attended the University of Berlin. In 1883 he became an instructor at Kiel University - where he first studied the work of Maxwell.
· Maxwell had theorized that electric fields in the form of waves propagated at the speed of light rather than instantaneously. To prove this, Hertz conducted a series of experiments between 1886 and 1889 involving measuring the strength of oscillations at differing points along a sheet of zinc. These experiments confirmed the existence of waves, and that these waves acted identical to light in regards to refraction and polarization. In short, Hertz had proven the theory of Maxwell that light itself was a form of electromagnetic radiation.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
Read previous mail | Read next mail
| |
