This thing. Please tell me if if my facts are right, since none of my material really covers it and I have had to piece this together from practice problems.
1. This is formed when 2 sound waves encounter each other
2. The distance between the two purple dots is the wavelength of the beat
3. The distance between the green dots is the wavelength of sound
I am a little confused because I thought the distance between the purple dots would be the 'wavelength'. But in EK they describe the conditions I stated above. Are these correct? TY