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1. Consider the following 13 decay chain with the half-lives indicated,
210 (22y) -> 210Bi (5d)-> 210P0 A sample contains 30 MBq of 210 Pb and 15 lVIBq of 210Bi at time zero.
(a) Calculate the activity of 210Bi at time t = 10 d.
(b) If the sample were originally pure 210 Pb. how old would it have been at time t = O?
2. A 40-mg sample of pure 226 Ra is encapsulated.
(a) How long will it take for the activity of 222 Rn to build up to 10 mCi?
(b) What will be the activity of 222 Rn after 2 years?
(c) What will be the activity of 222 Rn after 1000 y?
With a 500hp shunt wound DC motor, at 1800rpm, 500Vdc, FLA is 800Adc, Ra is 0.025 and Rf is 400. What would Va need to be if you wanted the motor to operate at 1000rpm at rated torque. Keeping the field current constant.
a) At what time t1/2 have half the atoms decayed b) How many atoms have decayed at t = 40 ns c) Draw a graph of Nexc as a function of time. Show in the graph the lifetime, 1t1/2, 2t1/2, 3t1/2 and 4t1/2.
An asset with a first cost of $50,000 is depreciated by the MACRS method over a 10-year period. If the asset will have a $20,000 salvage value, its book value at the end of year two will be closest to
a) Using 10 nF capacitors and ideal op amps, PROBLEM design a high-pass unity-gain Butterworth filter with a cutoff frequency of 2 kHz and a gain of no more than -48 dB at 500 Hz. b) Draw a circuit diagram of the filter and label all component valu..
Write down the Y-bus of the system and build this power system in PowerWorld Simulator and For the power system, find the VAR rating of a shunt capacitor bank at bus 2 that increases V2 to 0.95 p.u.
MOSFET Amplier Sketch the 4-resistor bias network for an amplier with an n-channel enhancement-mode MOSFET, with R1 = 1Mohm ; R2 = 1:5Mohm ; RD = 75kohm ; Rs = 39kohm ; K = 25microA/V2 ; VDD = 10V and Vto = 1V.
determine the following by sloving laplace equations: a) the potential and electric field distribution in the dilectric slab. b) the potential and electric feild distrivution in the air space between the dilectric slab and the upper plate and c) t..
A 1 MVA three-phase 6,600/400V delta/star connected transformer has the following parameters per phase. Calculate the per unit impedance of the transformer using base values of 1 MVA and 400 V.
A semiconductor has Nc=10^19 cm^-3, Nv=5x10^18 cm^-3 and Eg=2eV. If it is doped with 2x10^17 acceptors (fully ionized), calculate the electron, hole and intrinsic carrier concentrations at 627 C. Sketch the simplified band diagram, showing the pos..
You need to upgrade your crystallizer. Your company bought a new 1000 ft2 crystallizer 5 years ago for $450,000. You believe that your company has expanded sufficiently to need a 5000 ft2 crystallizer. What is the price in today's dollars
1. Define the function f[n] = en/4 sin(n/10)u[n] using Matlab inline function. Plot this function using stem command over [5, 20]. 2. Use Matlab inline and stem functions to plot u[n] and delta[n] over [10, 10]. 3. find out what Matlab filter functi..
An amplifier operating from a single 15-V supply provides a 12-V peak-to-peak sine-wave signal to a I-ill load and draws negligible input current from the signal source. The de current drawn from the 15-v supply is 8mA.
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