Why when you move from the longer bars to shorter on a xylophone pitch of sound rises?

When you move from the longer bars to shorter bars on a xylophone, the pitch of sound rises because the shorter bars vibrate at a higher frequency. The frequency of a sound wave is the number of times the wave repeats itself in a given amount of time, and it is measured in hertz (Hz). The higher the frequency, the higher the pitch of the sound.

The length of a bar on a xylophone determines how fast it vibrates. Longer bars vibrate more slowly than shorter bars, so they produce lower pitches. This is because the longer bars have more mass, and it takes more energy to move them back and forth. Shorter bars have less mass, so they vibrate more quickly and produce higher pitches.

The relationship between the length of a bar and the pitch of the sound it produces is called the frequency-length relationship. This relationship is the same for all musical instruments that produce sound by vibrating bars, such as the piano, harp, and guitar.