For a sound of a specific frequency, a delay of half the wavelength is equivalent to the invert of the wave https://graphtoy.com/?f1(x,t)=sin(x)&v1=true&f2(x,t

For a sound of a specific frequency, a delay of half the wavelength is equivalent to the invert of the wave https://graphtoy.com/?f1(x,t)=sin(x)&v1=true&f2(x,t)=sin(x-%F0%9D%9C%8B)&v2=true&f3(x,t)=&v3=true&f4(x,t)=&v4=true&f5(x,t)=&v5=false&f6(x,t)=&v6=true&grid=1&coords=0,0,12 https://graphtoy.com/?f1(x,t)=sin(x)&v1=true&f2(x,t)=sin(x-%...