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Sound is generated due to vibrations | Empty vessel makes more sound than filled vessel
When force is applied on a solid substance, it vibrates and so waves are generated due to which sound is produced. Velocity of sound is more in solids than that of liquids and air. Sound travels with lesser velocity in case of liquid or air. If an empty bowl is stricken, then the air inside and surrounding the bowl also gets vibrated. Due to that, the intensity of sound made by the bowl becomes higher than that of sound that should be caused by vibrations of the bowl exclusively. That means if the period of vibration is increasing, the intensity of sound also increases.
Empty vessels make bigger sound because of the long vibration period. Now fill the same vessel with water, and apply the force. Now the intensity of sound generated is less when compared to that of intensity of sound in previous case of empty vessel. In case of vessel filled with water, period of vibration is less. Hence the intensity of sound generated is less. In filled vessels, the vibrations stop quickly. But in case of empty vessels air helps to prolong the period of vibration and to increase the intensity of sound. That’s why empty vessel makes more sound than that of a filled vessel.
