Let us derive the relation of electric field intensity at finite distance from transmitter Antenna If a horizontal Hertzian dipole antenna is used as a
Today we will discuss a very important relation related to wave propagation. The equation is known as Friis free space equation. As only a small
When a radio wave is radiated from the transmitting antenna, it spreads in all directions with decrease in amplitude with increasing distance because of spreading
In a PN junction diode holes are the majority carriers on P side whereas electrons are the majority carriers on n-side. The process of diffusion
Cavitation is formation of vapor bubbles of a following liquid in a region where the pressure of liquid falls below its vapor pressure. Cavitation is usually of
Ultrasonic waves can be detected by various methods as listed below: (a)Using radiometer: Ultrasonic waves can be detected using Radiometer. In this method ultrasonic beam
A magnetostriction generator can produce ultrasonic waves of comparatively low frequency. For generating high frequency ultrasonic waves, piezoelectric generator is used. Piezoelectric Generator.
Magnetostriction: When magnetic field is applied across the length of a ferromagnetic rod such as Nickel, then change in the length of rod is observed.
Ultrasonics can be produced by means of (i) Galton’s Whistle (ii) Magnetostriction Generator (ii) Piezoelectric Generator or Oscillator. Galton’s Whistle. It contains of essentially a short
The following are the main properties of ultrasonic waves: The ultrasonic waves cannot travel through vacuum. These waves travel with speed of sound in a
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