homework help > physics > physics q&a board > topic: the beat heard by a bat...

Q BgQuestion:

      
Novice
Karma Points: 25
Respect (0%):
posted by  Renda1126 on 4/15/2009 1:20:56 AM  |  status: Live  |  Earned Karma: 25

The Beat Heard by a Bat

Course Textbook Chapter Problem Needs by
N/A Mastering Physics N/A N/A N/A
Question Details:
A bat flies toward a wall, emitting a steady sound with a frequency of 23.0 \rm{kHz}. This bat hears its own sound plus the sound reflected by the wall.

How fast should the bat fly, v_b, to hear a beat frequency of 220 \rm {Hz}?

Take the speed of sound to be 344 \rm m/s.
Tags: Physics
Bonus Point Alert! Earn +2 additional karma points for helping this gold member.

AAnswers:

Answer Question Ask for clarification
Rookie
Karma Points: 0
posted by Anonymous on 11/6/2009 5:34:10 PM  |  status: Live
Asker's Rating: This answer has not been rated. If you asked this question, then please login.   
Response Details:
Doppler effect

f1=  ((v + vl)/(v +vs))*fs

f1= 23000Hz ( frequency oflistener )
fs= f1+220Hz =23,220Hz ( frequency of source)
v= speed of sound 344 \rm m/s.
vl= speed of listener 
vs= speed of source
in this example the bat an wall is moving with the same speed ( vl= vs)

so

23000 =  ((344 + vl)/(344 - vs))*23,220
Answer Question Ask for clarificarion
Ask New Question

Join Cramster's Community

Cramster.com brings together students, educators and subject enthusiasts in an online study community. With around-the-clock expert help and a community of over 100,000 knowledgeable members, you can find the help you need, whenever you need it. Join for free today » How Cramster is different from tutoring »

Need Help In

Useful Links