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According to their frequencies, waves are separated into three categories:
(1) Audible or sound waves : Range 20 Hz to 20 KHz. These are formed by vibrating bodies like as vocal cords, membrane or stretched strings.
(2) Infrasonic waves : Frequency lie below 20 Hz.
Example : waves formed during earth quake, ocean waves etc.
(3) Ultrasonic waves : Frequency greater than 20 KHz. Human ear cannot listen these rays, certain creatures such as dog, bat and mosquito show result to these.
Q. A capacitor blocks d.c. but allows a.c. Why? Capacitive reactance XC = 1/ω C = 1 / 2πν C Where ν is the frequency of the a.c. supply. In a d.c. circuit
Objective After studying this unit, you should be able to: 1. explain the importance of international trade; 2. discuss why a fm is motivated to export; 3. identify
Area of a Circle As a Limit Describing that the area of a circle is a limit of the sum of the area of interior triangles as the number of triangles goes to infinity.
michelson interferometer
Discuss about the Single-mode fibre in short. Single-mode fibre: A single-mode fibre consists of a narrow core (8 to 10µm) and refractive index in between the core and cladd
It is described as the nature of charge potential of charge potential is of two types: (i) Positive potential: with respect to positive charge. (ii)Negative potential: with r
Electrical measuring instruments: Quantities of electrical current, voltage and resistance are measured using instruments called meters. Until the advent of electronic displays
What are the needs of light sources for fibre optic communication? Light sources for fibre optic communication should meet certain given requirements as illustrated below: a
Show that average value of Poynting vector for a plane e-m wave is 1/2 √μ/e XH 2 .
Example of an impure spectrum
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