Final Exam Questions #7- EMW

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  • DivisionofTechnicalEducationandManagementStudiesAppliedEngineeringScience ESC103

    PassExamQuestion Spring2009

    ElectroMagneticWaves&others

    Fall 2006 a) The diagram below shows the electromagnetic spectrum. Bands indicated by the arrows are

    labeled A F. List the name of the bands and indicate one application

    b) Fig 5a shows two long conductors attached to a DC power supply while Fig 5b

    shows the same apparatus connected to an AC supply. i) Describe in detail, using the system shown in the diagrams, how is an

    Electro Magnetic Wave is created. ii) Describe in detail, using the system shown in the diagrams, how an

    Electro Magnetic Wave is propagated.

  • Spring 2005 a) Briefly explain the following terns as they relate to sound:

    (i) Wavefront. (ii) Harmonics (iii) Decibel (iv) Transverse wave (v) Fundamental note (vi) Resonance (vii) Human audio range (viii) Beats (ix) Inverse square law

    b) State briefly Maxwells equations (in worded form).

    c) Identify the frequency bands indicated in the Electromagnetic spectrum above and state one application of each.

    d) Helen FM transmits its broadcast at 101.1MHz FM.

    (i) What is the wavelength of this signal?

    (ii) What are the limitations of this type of transmission?

    e) Explain why it is usually possible for us to see through the glass door into the domestic

    microwave oven yet the microwave radiation cannot escape through the door and cause

    harm.

    Fall 2004 a) State briefly Maxwells equations (in worded form).

    b) Clearly explain how an alternating source connected to two long straight pieces of

    conductors produces an electromagnetic wave.

    c) Helen FM transmits its broadcast at 101.1MHz FM.

    (iii) What is the wavelength of this signal?

    (iv) What are the limitations of this type of transmission?

  • d) Explain why it is usually possible for us to see through the glass door into the domestic

    microwave oven yet the microwave radiation cannot escape through the door and cause

    harm.

    Fall 2006 Explain the following terms:

    a) Longitudinal wave b) Standing wave c) Resonance d) Harmonics e) Human audio range f) Ultra sonic g) Intensity of wave energy h) Beats i) Sonic Boom