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One of the most common representations of dynamic coupling between two variables x and y is the "lead-lag" transfer function, which is based on the ordinary first-order differential equation
A diagram showing a dc generator working, on which the frequency of ration is adjustable. The results are seen on an analogue meter, and an oscilloscope screen. Useful description of the commutator.
A little program to show the product of interference of 2 waves. The simulation allows the user to vary the wave amplitude and frequency. This is a good very simple to use tool!
Heterodyning is a method for transferring a broadcast signal from its carrier to a fixed local intermediate frequency in the receiver so that most of the receiver does not have to be retuned when you ...
A Java applet of a wave where you can adjust its wavelength, frequency, and amplitude by clicking on the drop down list in the upper left corner, and then selecting one of the choices which appear.
Java applet demonstrating a RLC resonance circuit where the resistance, capacitance and inductance are change along with the frequency.
Most loudspeakers use multiple drivers and employ crossover networks to route the appropriate frequency ranges to the different drivers.
Picture of EM spectrum, with wavelength and frequency scale. Chart shows pictorial representation of size of wavelength and EM wave sources.
Bar codes may become a thing of the past/ Smart labels, also called radio frequency identification (RFID) tags, could change supermarkets forever. Find out how on this How Stuff Works page.
The frequency and wavelength of visible light is a very narrow band in the electromagnetic spectrum. Its wavelength lies between 400 and 750 nm
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