Questions asked
Explain the basic principles of microscopy and the different types of microscopes used in scientific research
True or false to determine lower of cost or market market is based on replacement cost
The effect of some tropic hormones is to stimulate release of other tropic hormones. True or False True False
Problem 2: Consider the function $f(x) = \frac{\tan(x) - 1}{\sec(x)}$. Compute $f'(x)$.
Bacterial cell cycle consists of... 3 stages: Growth phase, DNA replication, and Death 2 stages: Growth phase and Binary fission 3 stages: Growth phase, DNA replication, and binary fission 1 stage: Binary fission None of the above
A ring waveguide has a radius of 50 µm. You are given that the waveguide loss is 3 dB/cm. Calculate the self-coupling coefficient required to achieve critical coupling. Now, let's say you want to make a ring to be critically coupled but you don't know the power loss of it. What parameter of the ring waveguide geometry and layout can you modify/vary to make sure you achieve critical coupling of a simple ring resonator? Explain the answer in detail.
Consider the following input continuous-time signal: x(t) = − cos(100πt) + 2 cos(450πt + π/3) (a) Sample x(t) at a rate of fs = 500 samples/s. Determine the discrete-time signal x[n] after sampling. Does aliasing occur and if so, why? (b) Sample x(t) at a rate of fs = 400 samples/s. Determine the continuous-time signal xb(t) after sampling (C-to-D) and reconstruction (D-to-C). Does aliasing occur and if so, why? (c) Sample x(t) at a rate of fs = 275 samples/s. Sketch the Fourier spectrum of the sampled signal x[n] (over angular frequency -1200π <= ωs <= 1200π). Also, sketch the spectrum of the sampled signal x[n] (over normalized frequency -π <= ωb <= π). Label complex amplitudes in polar form.
6. A sample of 12 grams of a radioactive substance became 10 grams in 50 years. What is its half-life?
Compare between the following, then give an example for each of them: 1. Coding and Decoding 2. Bitmap and Vector Image representation 3. Audio and Video data representation 4. System Software and Application Software 5. Digital Forms and Optical Character Recognition
Q3 Consider the circuit shown in the figure. The AC generator in this circuit has an rms voltage V. Given the values R and L, find: a) the rms current in this circuit in the limit of high frequency. b) the rms current in this circuit in the limit of low frequency. c) Numerical: V=65V, R=15$\Omega$, L=0.22mH.
