1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quick echolocation question!

  1. Jul 4, 2006 #1
    if a dolphin swims towards some fish, and emits a high pitched sound. will the echo from this sound be observed (by the dolphin) as an increased/decreased frequency?

    my vote is increased

    ~Amy
     
  2. jcsd
  3. Jul 4, 2006 #2

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Yes should be. Analagous to the doppler effect in police cars etc.
     
  4. Jul 4, 2006 #3
    thanks :smile:

    here's another question:
    Vobserved = 2 m/s
    Vsound = 330 m/s
    Fsound = 96 Hz
    Fobserved = ?

    i calculated 96.58Hz or 9.7 * 10^1 Hz ?

    ~Amy
     
  5. Jul 4, 2006 #4

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Yeah looks ok to me. Although is vobserved supposed to be the speed the dolphin is travelling?
     
  6. Jul 4, 2006 #5
    thanks. no dolphin in the 2nd question. it's about a band marching away from a guy a the speed of 2 m/s.

    ~Amy
     
  7. Jul 4, 2006 #6
    another question:

    Find the second resonant length of an air column that resonates with a sound of frequency 1 kHz at 15 degrees C.

    a) the air column is closed at both ends

    b) the air colomn is open at both ends.

    c) the air column is open at one end and closed at the other end.

    can someone give me the formulas for b and c? :blushing:

    for a i figured out the wavelength to be 0.34085 m and the speed of sound to be 340.85m/s.

    so the resonant length ends up being 34 cm.

    o:)

    ~Amy
     
  8. Jul 4, 2006 #7
    update: for b i got 34 cm (same calculation as in "a")

    and for c i got 25.5 cm

    ~Amy
     
  9. Jul 4, 2006 #8

    nrqed

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Sounds all correct to me!

    Patrick
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Quick echolocation question!
  1. Quick questions (Replies: 1)

  2. Quick question (Replies: 1)

  3. Quick question (Replies: 2)

  4. Quick question (Replies: 6)

Loading...