Q # 1
Measuring wavelengths with a CD, A LASER beam of wavelength λ = 632.8nm shines at normal incidence on the reflective side of a compact disc. The track of tiny pits in which information is coded onto the CD are 1.60μm apart. For what angles of reflection (measured fro m normal) will the intensity of light be maximum? Marks = 7
Q # 2
The plate on the back of a certain computer scanner says that the unit draws 0.34A of current from a 120V, 60Hz line. Find (a) the root mean square current (b) the current amplitude (c) the average current (d) the average square current. Marks = 8
Q # 3
Give several examples of electromagnetic waves that are encountered in everyday life. How are they all alike? How do they differ? Marks = 5
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