)))))))Vu & Company((((((( PHY101 - SOLUTION REQUIRED

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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