...You stand...? ...directly in front of one of the speakers, 1.1 m from the speaker. What is the lowest frequency that will produce constructive interference at your location?
equations to use:
wavelength, speed, frequency
v = ?f
speed of wave on a string
v = ?F/?
tension force = F
mass per length = ?
Wave function:
y(x,t) = Acos(2?x/? - 2?t/T)
Sound intensity (power P, distance r from source):
I = P/A
Point Source:
I = P/4?r²
Intensity level and decibels:
? = 10log(I/I_o)
Doppler effect:
Moving observer:
f' = (1 + or - u/v)
u = speed of observer relative to stationary source
speed of waves = v = 343 m/s
f' (f prime) = frequency detected by observer
Moving source:
f' = [1/(1+or- u/v)]f
General case (both source and observer moving):
f' = [(1+or- u_o/v)/(1+or- u_s/v)]f
where u_o = observer speed
and u_s = source speed
equations to use:
wavelength, speed, frequency
v = ?f
speed of wave on a string
v = ?F/?
tension force = F
mass per length = ?
Wave function:
y(x,t) = Acos(2?x/? - 2?t/T)
Sound intensity (power P, distance r from source):
I = P/A
Point Source:
I = P/4?r²
Intensity level and decibels:
? = 10log(I/I_o)
Doppler effect:
Moving observer:
f' = (1 + or - u/v)
u = speed of observer relative to stationary source
speed of waves = v = 343 m/s
f' (f prime) = frequency detected by observer
Moving source:
f' = [1/(1+or- u/v)]f
General case (both source and observer moving):
f' = [(1+or- u_o/v)/(1+or- u_s/v)]f
where u_o = observer speed
and u_s = source speed