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Waves question (wavelength, period, etc)

  1. Jun 19, 2011 #1
    1. The problem statement, all variables and given/known data
    A transmitter sends out 1.8x10^7 waves per minute and generates a standing wave pattern. The radio waves travel at the speed of light to a receiver 20.0km away. Determine :
    a) the frequency in herts
    b) period
    c)wave length
    d) the time for one crest to travel from the transmitter to the receiver.
    e) the number of nodes between the transmitter and the receiver.

    2. Relevant equations
    F=1/t t=period, f=frequency
    V=f x (wavelength)

    3. The attempt at a solution
    i found b first by
    60 seconds/ 1.8 x 10 ^7
    =3.3 x 10^-6
    a) 1/3.3 x 10^-6
    =300,000 herts
    im confused after this can someone help me please? thankyou
     
  2. jcsd
  3. Jun 19, 2011 #2

    Redbelly98

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    Try using that last equation to find wavelength.
     
  4. Jun 19, 2011 #3
    so

    3.00x10^8 m/s / 300,000 = wavelength?
     
  5. Jun 19, 2011 #4

    Redbelly98

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    Yes (if you include the units along with that 300,000 number).
     
  6. Jun 19, 2011 #5
    what about the other questions any tips?im lost
     
  7. Jun 19, 2011 #6
    can anyone please help me? i have a final exam tomorrow :(
     
  8. Jun 20, 2011 #7

    Redbelly98

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    d) How far apart are the transmitter and receiver? How long does it take to go that distance, travelling at the speed the radio waves are going?

    e) This is related to how many wavelengths will fit between the transmitter and receiver. Also, you'll need to look up what a node is, and how that relates to the number of wavelengths.

    Good luck on your test.
     
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