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Homework Help: Superposing of two waves

  1. Mar 7, 2010 #1
    1. Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y=3sin(0.25pi x)cos(10pi t). What is the distance (in m) between the first two antinodes?
    4
    0.8
    2
    5
    7



    assumption 4?


    Two harmonic waves are described by

    y=4sin(3x-200t)
    y=4sin(3x-200t-5)



    What is the amplitude of the resultant wave?
    4.3
    4
    8
    6.4
    5.7
    assumption 6.4? as it is 2Acos(phase/2)....



    Finally :s
    A stretched string is observed to vibrate in four equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?

    Select the correct answer.
    370Hz

    120 Hz

    245 Hz

    619 Hz

    494 Hz



    assumption 120Hz as f proportional to n
    Just tell me if anything is wrong please.thanks in advance.


     
  2. jcsd
  3. Mar 7, 2010 #2
    1st one is 4
     
  4. Mar 8, 2010 #3
    thanks for the help.
    anyone can help me check the others?assumptions are my trials
     
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