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Describe the operation of a transistor amplifier in CE configuration.
Ans: Operation of a Transistor Amplifier in CE configuration: A Common Emitter NPN transistor is demonstrated in fig. (a). When a signal is applied in emitter-base junction, during positive half cycle, forward bias across this junction increases. This increases the flow of electrons from emitter to collector via base and hence increases the collector current. Increased collector current produces more voltage drop across the collector load resistor RC. Though, during negative half cycle of the signal, forward bias voltage across the emitter-base junction decreases. This decreases the collector current which consequently decreases the voltage drop across collector load resistor RC. Thus, an amplified signal appears across the collector load resistor.
if in an interference pattern,the ratio between maximum and minimum intensities is 36:1,find the ratio between the amplitude and intensities of the two interfering waves.
When an electron makes transition from higher energy level having energy E2(n2) to a lower energy level having energy E1 (n1) then a photon of frequency v is emitted.
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