Chapter 5, Problem 41P

QUESTION E True or falset A narrow band pass spectrophotometer produces more sensitive measurement and is less affected by wavelength calibration error than a wider band pass spectrophotometer. O True O False QUESTION In a spectrophotometric determination, which one of the following is the formula for calculating the absorbance of a solutiont O (Absorptivity concentration) / light path in cm O (Absorptivity = light path in cm) / concentration O Absorptivity light path in cm concentration O (Light path in cm concentration)/absorptivity QUESTION 10 Which of the following statements is TRUET O Partition chromatography is most appropriate to identitying analytes that may be distrituted between two liquid phases O Steric endusion chromatography is best suited for separating analytes based on their solubility in the mobile solvent. Oin liquid-solid chromatography, the stationary phase separates analytes based on size, shape, and polarity O lon eschange chromatography has a resin phase that…

An air-filled rectangular waveguide has a cross sectional dimensions of a = 200 mm and b = 100 mm. Calculate the possible TE modes that can be transmitted at frequencies below 5 GHz and calculate the cut-off frequency for modes TE01 and TE02.

Problem 3. Consider the direct-sequence CDMA system as de- scribed in Lecture 15. At the receiver suppose that instead of using the local code qi(t) we instead use q₁(t+A) where A is some ± fraction of a bit time, i.e., the local code may be shifted one direction or the other. Compute the degradation (in dB) to E₁/No due to a nonzero A at the output of the corre- lator for BPSK signaling. You may assume for the local code that adjacent chips are equally likely to match or differ.

In an aircraft, to protect a PCB from external interference signals it is housed in an Aluminum(Al) Box (this is normally referred to as shielding). Conductivity of Al is 38.2 x 106 S/m & µr = 1. What shall be the minimum thickness of the Al sheet from which this box is made, if we have to block 1.6 MHz interference signal from passing through this sheet?

Some neodymium–glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 mm. How much energy is contained in a single pulse?

A carrier signal of 10 V amplitude is modulated by an information signal to a depth of 80%. Calculate the Vmax and Vmin for the modulated wave.

An NRZ polar code is using the following function to represent the 1's: p(1) =s inc(xt/T,) a) Find (with details) and sketch the power spectral density? b) What is the bandwidth of this line code? c) Does this line code includes a DC component?

A Narrow Band Frequency Modulated signal, with fm =10 kHz, fa =100 MHz, Af; = 5SKHZ is applied to a frequency multiplier with a factor of 3 to convert it to a Wide band FM signal, the output of the multiplier has a WBFM with,

A. By calculations show that: Ve v =(2 sin(@ct) + d x cos[(wc – Wm)t] – d x cos[(wc + wm)t]) where d = m (sometimes called the depth of modulation if given as a percentage). B. Using MATLAB, plot on separate figures the following, assuming wm = 1, Wc = 10 rad/s, Ve Vm = 1 volt., time taken from 0 to 10 seconds. Vc