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The light from a cameras electronic flash is produced when a highvoltage obtained by charging a capacitor is applied to electrodesin a xenon-filled flash bulb.
(a) to what voltage would a 60-microfarad capacitor be charged by a6mA current lasting 10 seconds?
(b) if the bulb when conducting current and emitting light acts asan 0.1-ohm resistor what is the time constant for discharging thiscapacitor?
A piece of germanium doped with 1016 cm-3 shallow donors is illuminated with light generating 1015 cm-3 excess electrons and holes. Calculate the quasi-Fermi energies relative to the intrinsic energy and compare it to the Fermi energy in the absen..
An emitter-follower circuit is built using an npn transistor with ß=100 and with RE =1k-ohm. What is the input impedance of the open circuit. If a load of 100-ohm is connected to the output of the circuit, what is the input impedance
If the lower and upper specification for voltage are 4.95V and 5.05 V, respectively what is the probability that a power supply selected at random will conform to the specification on voltage
A dielectric sphere has radius r = 2 and the material inside the sphere has dielectric constant er2 = 4. THe region outside the sphere where r > 2 is free space and the electric field there is E1=(16r+2+8\phi). Find electric field E2 inside the sp..
A serial input finite state machine has one input and one output. The output becomes 1 and remains 1 thereafter when at least two 0's and at least two 1's have occurred as inputs, regardless of the order of occurrence. Draw a state diagram for the..
One of the home satellite services uses a dish antenna having a diameter of 18" (0.457 m) and frequency of 12.45 GHz. If the illumination efficiency is 70%, determine the gain of the antenna in dB
What do the letters PCM and PAM stand for? Why is PCM transmission preferred over PAM transmission? Give at least two reasons in your answer.
You have a shortwave AM receiver (just an AM receiver that has the capability to receive signals in the FM frequency band) that receives an NBFM voice signal at some carrier frequency. You notice, however, that while the signal strength is maximiz..
S = {c(k + jl) | k = 3, 1, 1, 3 and l = 3, 1, 1, 3 and j = square root of -1, where c is a constant. Determine the value of c to ensure a unit energy constellation. Sketch this constellation. Find d^2 min and label the constellation points with bi..
An embedded system consumes the following current when in different operating modes: Operating Mode Avg. Current Time Data Acquisition 4.2 mA 1.8 ms Communication 22.6 mA 2.5 ms Sleep Mode 0.5A 5 hours
Design a circuit using JK flip-flops that takes in a binary stream B0B1B2B3 and outputs 1 at a time t if the stream recieved thusfar (i.e. BoB1..Bt-1Bt), when read as an unsigned binary number, is divisible by 3.
Use the initial and final value theorems to find the initial and final value of the time function corresponding to the following Laplace transform X(s) = x/(s+1)(s+4)
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