Astudent makes a sound by blowing into the mouth of an empty soda bottle. how could the student make the sound louder?
a. increase the frequency by adding water to the bottle.
b. decrease the amplitude by blowing with less force.
c. increase the amplitude by blowing with more force.
d. decrease the frequency by blowing into a different bottle

a. increase the frequency by adding water to the bottle.

Explanation:

When someone blows over the mouth of the bottle, air can flow into or pass over the bottle. At the right speed and angle, air will first enter the bottle and increase the pressure inside it. This pressure forces the air out again and pushes it against the flow of air over the bottle. This flow of air over the mouth further sucks air out of the bottle. Since the pressure in the bottle is low enough, the air blown over the mouth of the bottle is sucked in again and the cycle repeats.

When this person fills the bottle with more water, the space for air to create pressure is reduced, and the air inlet and outlet cycle is accelerated. In this way, pressure waves are generated at a higher frequency - which we perceive as a higher pitch.

In summary, we can say that the correct answer to your question is the letter A.