What is wave and sound?

Answer 1

SOUND - CRASH! BANG! Did you hear that sound? It was made by air vibrating. The same is true for sounds made by Musical Instruments. The difference between NOISE and MUSIC is that musical sounds are organized into patterns that have pitch and rhythm. Noise is just random, disorganized sounds. Sounds are made and travel in the same way whether they are musical sounds or noise.

A musical sound is called a tone, and is produced by air vibrating a certain number of times per second. These vibrations are called waves. These sound waves must be contained in some way so that the performer can control the loudness, quality of the tone, and how long it plays. Most musical instruments have a reed, a string, or some other device that creates sound waves when moved. Sounds are different because of harmonics, which are higher and quieter sounds mixed in. They are not heard separately, but add to the tone of the sound, making an Oboe sound different from a Trumpet or drum.

The number of times that a sound wave vibrates in a second is called its frequency. Scientists even have a name for how they measure the frequency of sounds. They measure it in cycles and call it hertz. High notes have a higher frequency than lower notes and this changes their shape. Different types of sound waves have different shapes. Look at these images to see what sound waves "look" like.