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An electronic timer consists of a resistor whose value is 10,000 ohms, a capacitor of 30 pico farads, and a 10 volt source which is applied across the RC connection at time t =0.
The photoelectric threshold wavelength for Tungsten is 2300 Å. Find the energy in eV of the emitted electrons from the surface by ultraviolet light of wavelength 1800 Å.
(a) Show that the actual response at f=fT is approximately 9dB below the maximum value. What is the phase angle at this frequency (b) what is the slope of the magnitude plot for f>>fT What is
A photoelectric surface has a work function of 4eV. What is the maximum velocity of the photoelectrons emitted by light if frequency 10^15 Hz incident on the surface h = 6.6 * 10^-34 Joules-second e
A causal LTI system has the difference equation y[n]+0.25y[n-1]-0.125y[n-2] = x[n]+x[n-1]. What is the impulse response of this system and what is it's output y[n] for input signal x[n] = (-1)^n u[n].
A lossless transmission line with a characteristic impedance of 75 ohms is terminated by a load of 120 ohms. The length of line is 1.25 lamda. If the line is energized by a source of 100 V (rms) wit
The resistance of the coil is 0.2 ohm. The inductance of the coil is 1.2e-4 H. The rotor inertia is 1.0e-5 kg m2. The current to torque gain is 0.03 Nm/A. The friction torque is 0.09 Nm. A 12 V volt
The resistance of the coil is .4 ohm. The inductance of the coil is 2.4e-4 H. The rotor inertia is 2.0e-5 kg m2. The current to torque gain is 0.06 Nm/A. The friction torque is 0.18 Nm. A 12 V volta
The space between the plates is then filled with a dielectric material, with dielectric constant k = 6.55. What must the magnitude of the charge in micro coulombs on each capacitor plate now be, to
The signal x(t) = 20*sinc2(400t) is input to a ring moodulator. Sketch the spectrum of vout and find the range of values of fc that can be used to transmit this signal.
The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils
A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 load. What is the efficiency of the transformer
A single silicon photovoltaic cell is found to have an open-circuit voltage of 0.6 V and a short-circuit current of 15 mA in full sunlight. Show how a collection of these cells can be arranged to de
An electric dipole has opposite charges of 5.0x10^-15 C separated by a distance of .40mm. It is oriented at 60 degrees with respect to a uniform electric field of magnitude 2.0x10^3 N/C. Determine t
A device for heating a cup of water in a car connects to the car's battery, which has an emf EMF = 10.0 V and an internal resistance r_int = 0.08 \Omega. The heating element that is immersed in the
a. Functionally, how do closed-loop systems differ from open-loop system b. State one condition under which the error signal of a feedback control system would not be the difference between the inpu
Consider a thin ring of radius a with uniform charge density and total charge Q. The ring is cut in half across the diameter and the two halves superimposed to double the effective charge density.
One of the ways to look at programming at the assembly-language level is to consider it as putting together code fragments that do various little jobs. (This is a little higher-level than just think
If memory on a single memory chip ranges from address 100000H to 8FFFFH, how many kilobytes of memory are there on this chip if the memory is byte addressable
If one page of memory can store 25 lines of characters with each line con- taining 80 characters, how many pages of information are there in 3 GBs of memory
Suppose you are given the following task: "Find the smallest (in the signed sense) of a sequence of 100 8-bit values stored in sequential file register locations starting at file register 800." Writ
a) If m1 and m2 are minterms of n variables, prove that m1 OR m2 = m1 XOR m2 b) Prove that any switching function can be written as the exclusive-OR sum of the products where each product does not c
An initially uncharged 2 microfarad capacitor is connected in series with a 10 k-ohm resistor and a 12 V battery. Find the charge and voltage on the capacitor after a very long time and find the vol
Three capacitors are connected in series across a 100 V battery. If the capacitances are 1 microfarad, 0.1 microfarad, and 0.01 microfarad, respectively, calculate the potential difference across ea
If a 2 microfarad capacitor is charged to 12 volts and then connected across a resistor of 100 ohms: Determine the initial charge on the capacitor, initial current through the 100 ohm resistor and the