ToughSTEM
Sign Up
Log In
ToughSTEM
A question answer community on a mission
to share Solutions for all STEM major Problems.
Cant find a problem on ToughSTEM?
0
a car moving at 140 mi/hr passes a stationary police car whose siren has a frequency of 500hz. what is the frequency change heard by an observer in the moving car as he passes the police car? the velocity of sound in air is 343m/s. (1mi=1.609km) answer in Hz
Edit
Added Tue, 04 Aug '15
Community
1
Comment
Add a Comment
Solutions
0
v = 140*1.6 = 224 km/hr = 62.22 m/sec

initial frequency when car was approaching:

f1 = f*(c/ (c - 62.22)

f1 = 610.79

final frequency when source is moving away

f2 = f*(c/(c+62.22)

f2 = 423.22

change = 610.79 - 432.22 = 187.56 Hz
Edit
Added Tue, 04 Aug '15
Community
1
Comment
Add a Comment
Add Your Solution!
Close

Click here to
Choose An Image
or
Get image from URL
GO
Close
Back
Add Image
Close
What URL would you like to link?
GO
α
β
γ
δ
ϵ
ε
η
ϑ
λ
μ
π
ρ
σ
τ
φ
ψ
ω
Γ
Δ
Θ
Λ
Π
Σ
Φ
Ω
Copied to Clipboard

Add Your Solution
Sign Up
to interact with the community. (That's part of how we ensure only good content gets on ToughSTEM)
OR
OR
ToughSTEM is completely free, and its staying that way. Students pay way too much already.
Almost done!
Please check your email to finish creating your account!
Welcome to the Club!
Choose a new Display Name
Only letters, numbers, spaces, dashes, and underscores, are allowed. Can not be blank.
Great! You're all set, .
A question answer community on a mission
to share Solutions for all STEM major Problems.
Why
The Purpose
How
The Community
Give Feedback
Tell us suggestions, ideas, and any bugs you find. Help make ToughSTEM even better.