Question

This experiment requires two speakers that can be separated by some distance (try 1-2 meters). Try playing a single frequency using a tone generator and walk side to side in front of the speakers. Can you hear where there is constructive and destructive interference? Can you predict where the sound will get louder or quieter? What changes when you change the frequency?

Answer 1

if the speakers are set approximately 1 or 2 meters apart and produced identical tones.

two sound waves traveled through the air in front of the speakers and spread over the room or area .

so we get step by step hear the loud sounds as we gone anti-nodal locations

and

also no sound as approached to nodal locations.

sound waves that would be reach the nodal locations directly from the speakers will produce destructive interference

so these areas we can predict the sound will get louder and quieter.

when change in the frequency the sound values changes as above.

this is based on that the sound waves are longitudinal waves. ( compressions and rare fractions )