Pitch: Indicates the pitch of the sound. The pitch mainly depends on the frequency of the sound source's vibration. We can change its frequency by changing the characteristics of the sound body itself (such as length, tightness, size, volume, thickness), thereby affecting the pitch of the sound. Timbre: Indicates the quality of the sound. Generally speaking. Different objects emit different sounds. For example, different people emit different sounds, and their timbres are different. Use a thin stick to gently tap the glass filled with water. Since the amount of water in the cup is different, its vibration frequency is different and the tone is different. Watermelon: The lower the tone of the sound, the riper the watermelon, and vice versa. The rough dividing line between raw and cooked watermelons is around 500Hz. Most of the knocking sound vibration frequencies greater than 500Hz are raw melons, and those with less than 500Hz are mostly ripe melons. This is because the watermelon contains different percentages of water at different stages of maturity. When the watermelon is raw, it contains more water, and the melon capsules are stronger, so the sound is crisper. When the watermelon matures, the water content in its body also decreases, and there are some gaps between the melon capsules, so the sound it makes becomes louder. If the watermelon is overripe, it will contain less water and the sound will be muffled.

Reference materials: /101Resource006/wenjianku/200646/101ktb/xf2p0421.htm When love has become a habit 2007-08-17 09:59 Report