Respuesta :
Answer: Mass of Air and natural frequency
Explanation:
When you pour liquid in a tall, narrow glass. You may hear a sound with slowly rising pitch. This is due to the fact when you add liquid in a glass the volume of the liquid in glass increases and the volume of air in the glass decreases. This volume of air has a mass and this is the reason for producing the sound of pitch in the glass. Now as the volume and in turn mass of air is being reduced it results in slowly increasing the pitch as the glass is filled by the liquid.
Another point to consider is due to result of changing of the resonance of glass. As the liquid is filled the natural frequency at which the glass resonates also changes due to disturbance being produced in the glass. As a result the pitch steadily keeps on increasing as the glass resonance is amplified on the natural frequency and other frequencies are erased.
When we pour liquid in a tall, narrow glass, we hear sound with a steadily rising pitch which is of air coming out of that narrow glass.
Is Everything really empty?
Every empty place we see is never empty and is generally filled with air, although we don't feel the air in the place because of its less density.
Why do we hear pitch-rising sounds?
When there is a narrow glass, the glass is already filled with air, and when the liquid is poured into the glass, the liquid takes the place of the air and pushes it outwards therefore, the sound we hear is the sound of the air, that is coming out of the narrow pipe.
Learn more about Air:
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