# Question #93664

Jan 11, 2018

0.73 meters

#### Explanation:

Wavelength of sound in this case,$\lambda$=(velocity/frequency) i.e 0.7 meters
Now,consider an arch of a circle,where those two points are present with an angular separation of $\theta$=60 degrees
So,the radius of the circle is the wavelength of sound,as sound goes to these two points which creates this phase difference.
Now,considering the arch to be very small,we can say length of the arch=distance between those two points=$r \cdot \theta$
Now as r=$\lambda$ and theta=$\frac{\pi}{3}$ (in Radian)
Distance comes out to be $0.7 \cdot \left(\frac{\pi}{3}\right)$
Or,0.73 meters