Whether the water tone is higher or lower when the water bottle is tapped is as follows:

The water tone is lower when the water bottle is tapped. The sound produced by knocking water in a glass bottle is the vibration of the glass bottle and water, which is equivalent to a percussion instrument. The less water is filled, the higher the pitch; the more water, the slower the vibration of the bottle is, and the lower the pitch.

The natural frequency of water is the same. If it is the same water, but the material shape or the amount of water composed of water in the bottle is different, the time and amplitude of the vibration fluctuation will be different, resulting in hearing loss. on the difference. When knocked, the water cup vibrates together with the water inside. The more water there is, the slower the vibrations will be. This is because the energy given by knocking is certain. When the energy is certain, the greater the mass of the object, the slower the vibration speed.

When you blow, only the air in the bottle is vibrating. So the more water there is, the less air there is. This is because the volume of the bottle is fixed. Likewise, the less air there is, the faster it vibrates when you blow it. The same is filled with water in a container and then given an incentive. The principles of sound production of these two phenomena are different.

Extended knowledge:

If we tap bottles with different amounts of water, the pitch will depend on the length of the air column inside the bottle. According to music theory, the longer the air column inside the bottle, the lower the pitch it produces; the shorter the air column, the higher the pitch it produces.

When we knock bottles with different amounts of water, the bottom of the bottle will make a sound. This is because the knocking vibration is transmitted to the air column of the bottle, producing sound. The length of the air column depends on the amount of water in the bottle. The more water, the shorter the air column; the less water, the longer the air column.

So when we tap bottles with different amounts of water with similar force, bottles with less water will produce a higher pitch, while bottles with more water will produce a lower pitch. This is because the different lengths of the air columns lead to different chirping frequencies, resulting in different pitches.

Sound is produced by vibration and is mediated by air. Because the amount of water in the bottle is different, the amount of air in the bottle is also different. The amount of air is different, which affects the frequency of the sound. The same knock. The more air there is in the bottle, the less the air molecules will be affected by vibration and the sound will be lower. On the contrary, the sound will be higher.