Which of the following modes is utilized in the production of sound by humans?
A) Vibrating membrane
B) Vibrating plates
C) Vibrating strings
D) Vibrating air columns

Dear Student
Instruments such as woodwinds, the brasses and the organ pipes produce sound from the vibrations of  waves in a column of air with in a pipe or tube.(Vibrating Air Column) to produce sound.
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vibrating air columns
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