Sound intensity
In physics, the amount of energy per unit area per unit time perpendicular to the direction of propagation of sound waves.
There are not only strengths and weaknesses of voices, but also high and low.
Tone
The level of sound.
The pitch is determined by the vibrational frequency:The frequency is high, the pitch is high;The frequency is low and the pitch is low.
How does sound come about?
It is a mechanical wave produced when an object vibrates, which causes our auditory organs to react.
Whether it is a gas, a liquid or a solid, any vibration can make a sound. For example, the north wind howling, which is the sound made when the air vibrates. Vibrating solids, liquids, and gases are all sources of sound.
The sound produced when an object vibrates is integral.
In daily life, people can judge the quality of objects based on their sounds.
For example
When the bell is struck, a good bell can make a crisp and loud sound, but a broken bell can only make a muddy sound or no sound.
The sound carries a message from inside the bell, helping people to find invisible cracks.
The reason for this
In a good clock, the parts can vibrate together, and with a crack, the parts cannot vibrate together, so that the sound they produce is different.
With this law, the method of percussion to detect the inside of an object has been widely used.
Workers often use hammers to hit machine parts to determine whether there is damage inside the machine or whether the joints are loose.