- #1
brunettegurl
- 138
- 0
sound waves(phase difference) URGENT PLS. HELP
2 speakers ,in phase, have a frequency of 170Hz [so lambda= 2m; the speed of sound is 340 m/s] As you move along the x axis, where is the sound:
a)a minimum (compared to nearby pts.)
b)a maximum (compared to nearby pts.)
r2-r1=delta r
so for a) i know that there shld be no sound and that occurs the 1st minimum @ lambda/2
so i did r2-r1 =lamda/2
r2=sqrt(64+r1^2) therefore
sqrt(64+r1^2)-r1=2/2
and this is where i am stuck everytime i open it up the r1 gets canceled or i have r1^2-r1=-63 ..i'm supposed to be getting an r1= 31.5 m ..please help
Homework Statement
2 speakers ,in phase, have a frequency of 170Hz [so lambda= 2m; the speed of sound is 340 m/s] As you move along the x axis, where is the sound:
a)a minimum (compared to nearby pts.)
b)a maximum (compared to nearby pts.)
Homework Equations
r2-r1=delta r
The Attempt at a Solution
so for a) i know that there shld be no sound and that occurs the 1st minimum @ lambda/2
so i did r2-r1 =lamda/2
r2=sqrt(64+r1^2) therefore
sqrt(64+r1^2)-r1=2/2
and this is where i am stuck everytime i open it up the r1 gets canceled or i have r1^2-r1=-63 ..i'm supposed to be getting an r1= 31.5 m ..please help