Physics II

 
  • Electrons and Photos P21217003

    Electrons and Photos P21217003

    Unit – III Applications of Photoelectric Effect Construction & Working of Photovoltaic Cell Photo-electric cell or photo cell is an electronic device which works on the principle of photoelectric effect and converts light energy into electrical energy. Construction: 1. Photocell consists of evacuated glass tube containing two electrodes emitter (C) and Collector (A) 2. The emitter is shaped in the form […]

     
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  • Electrons and Photos P21217002

    Electrons and Photos P21217002

    Unit – II Explanation of Photoelectric Effect Planck’s quantum theory 1. The quantum theory was proposed by Max Planck. 2. According to this theory, radiation from a source is not emitted continuously, but it is emitted in packets or bundles of energy. These packets are called quanta or photons. 3. If the radiation is of frequency ν, each quantum has energy hν where […]

     
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  • Electrons and Photos P21217001

    Electrons and Photos P21217001

    Unit – I Photo Electric Effect Photoelectric effect: The phenomenon of emission of electrons by a certain metal surface when radiation of suitable frequency is incident on it is called photoelectric effect. Photoelectron: The phenomenon of emission of electrons by a certain metal surface when radiation of suitable frequency is incident on it is called photoelectric effect and emitted electrons are […]

     
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  • Communication System P21210003

    Communication System P21210003

     Unit – III The need of Modulation in Communication System: 1. The purpose of a communication system is to transmit information or message signals. Message signals are also called baseband signals, which essentially designate the band of frequencies representing the original signal, as delivered by the source of information. 2. No signal, in general, is a single frequency sinusoid, but it […]

     
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  • Communication System P21210002

    Communication System P21210002

     Unit – II Earth’s Atmosphere: Earth is surrounded by an envelope of gases called the atmosphere. The atmosphere plays an important role in the transmission of electromagnetic waves. The earth’s atmosphere is broadly divided into four different layers. Troposphere: The layer of the atmosphere extending up to a height of 12 km from the surface of the earth is called the […]

     
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  • Communication System P21210001

    Communication System P21210001

    Unit – I Communication: Communication is the process of exchange of information between two entities. It involves sending, receiving and processing of information. Communications System: The communication system is a device or setup used in the transmission of the information from one place to another. The nature of communication may be electrical, electronic or optical. Elements of Communications System: The Basic […]

     
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  • Semiconductors P21219005

    Semiconductors P21219005

    Unit – IV Digital Electronics and Logic Circuit: 1. George Boole, a mathematician, developed Boolean algebra based on the science of logic. In 1938, a scientist called Shenon developed electrical circuits based on the Boolean algebra which are known as logic circuits. 2. In amplifier or oscillator circuits, the current or the voltage continuously change with time from minimum to maximum. […]

     
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  • Semiconductors P21219004

    Semiconductors P21219004

    Unit – III Transistors: 1. Transistor consists of three layers made up of p and n-type semiconductors. The transistor is an arrangement obtained by growing a narrow section of one type of semiconductor crystal between relatively wide sections of other types. 2. When the n-type crystal is grown between relatively wide sections of p-type crystals then the transistor is called PNP […]

     
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  • Semiconductors P21219003

    Semiconductors P21219003

    Unit – II Circuit Diagram: Voltage across the diode can be varied with the rheostat. The milliammeter or the micro-ammeter measures the current. Forward Bias: a) In forward bias, the emf of the battery and the p.d. across the depletion region oppose each other which reduces the depletion barrier p.d. and decrease in its width. The electrons flow from N-type to […]

     
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  • Semiconductors P21219002

    Semiconductors P21219002

    Unit – I B PN Junction: 1. When a crystal of semiconductor is doped such that half the portion of the crystal is doped with a trivalent impurity and other half is doped with a pentavalent impurity, then the junction (boundary) formed is called p-n junction. 2. The crystal itself is called semiconductor diode or a solid state diode 3. Due […]

     
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