Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves. a microphone in the headphones receives waves of one frequency. a loudspeaker in the headphones then produces a wave of that frequency but of a different phase. what is the phase difference between the external sound wave and the wave produced by the loudspeaker in the headphones? a. 90 b.180 c 270 d 360

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!