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a) Sketch a simple vacuum tube device and the associated circuitry for measuring Em in a photoelectric effect type experiment. The electrodes can be placed in a sealed glass envelope.b) Sketch the photo current I vs. retarding voltage V the you would expect to measure for a given electrode material and configuration. Make the sketch for several intensities of light at a given wavelengthc) The work function of platinum is 4.09ev what retarding potential will be required to reduce the photocurrent to zero in a photoelectric experiment with Pt electrodes if the wavelength of the incident light is 2440 angstrom? Remember that energy of qI is lost by each electron escaping the surface.
at room temp a power transistor has beta of 160 and it is used in a DC dimmer circuit to control a 24 volt 120 watt lamp the lamp power supply is 48 volts dc and it can deliver a maximum of 21 amperes of current
Identify the type of cable that is permitted in single- and multifamily dwelling units but that cannot be used underground, nor in buildings that are more than three stories above grade, nor in commercial garages, motion picture studios, theaters,..
a small loop of wire of radius 1.8cm is placed at the center of a wireloop with radois 25cm. the planes of loops are perpendicular to eachother and a 7A current flows in each. Estimate the torque the large loop exerts on the smaller one.
For a conductive metal the Fermi energy was determined to be 7.01eV at 300K. a)What is the probability of an electron occupying the energy level of 7.15eV b)What would the probability become if the temperature rises to 757°C
Assuming that the effective mass of electrons in the conduction band of GaAs is temperature independent and equal to m* = 0.067mo* , determine the effective density of states Nc at T1= 77k, Tr =300k and Th=450k.
Read the binary number from the user and store it into a C string (i.e. char[ ]) The c string shall be able to accommodate a 32 bit binary number, note each digit in the binary number is a character, and there must be a null character at the end ..
A temperature transducer has the relationship R=200 + 10T where R is in ohms and T is in Celsius. The problem specifications are: Range is 30=T=50°C Resolution is 0.01°C Frequencies of interest are 0 to 100Hz Transducer dissipation constant is 20 mW..
A 480 V permanent magnet ac motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 ohms per phase. Core losses are 100 W. Mechanical losses are 250 W. Stray losses are 1.5% of the input power
A capacity coupled amplifier has a midband gain of 1000 V/V, a single high-frequency pole at 10 kHz, and a single low-frequency pole at 100 Hz. Negative feedback is employed so that the midband gain is reduced to 10.
An Ericson cycle operates on 0.227 kg of nitrogen from 650oC to 92oC. If 68kJ of heat is added during the isothermal expansion process, determine a) the overall expansion ratio; b) the heat transferred to the regenerator
ASSUME THE NSC HAS A NEW INSTRUCTION CALLED INC (OPCODE = "11") THAT INCRMENTS THE CONTENT OF THE OUT REGISTER; THE INC INSTRUCTION DATA FIELD IS UNUSED. ALSO ASSUME THAT THE LOC INPUT IINPUT IS TIED TO THE COMPLIMENT
Assume initially that no inputs have been seen and create a special initial state with output 0 to start the Moore machine. Draw a state graph for a Moore machine (minimum number of states is 5).
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