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Homework Help: Velocity of a plane when you hear a sonic boom?

  1. May 31, 2017 #1
    1. The problem statement, all variables and given/known data
    A plane flies directly over your head. When the plane is 45° above the horizon from your perspective, you hear a sonic boom. How fast is the plane flying?

    2. Relevant equations
    Doppler effect for a receding source
    f- = fo / (1+Vsource/c)

    3. The attempt at a solution
    Any help would be appreciated, I'm not sure where to start!
  2. jcsd
  3. May 31, 2017 #2


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    The doppler shift of the frequency is not relevant. You need to make a triangle diagram of the speeds and do a little trigonometry.
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