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Harmonica sound reference11/19/2022 Humans typically hear sounds with a frequency between 20 and 20,000 Hz. The frequency is commonly measured in Hertz (Hz), where one Hertz equals one vibration per second. The vibration happens at a specific rate and generates a sound of the same frequency. The vibrating rubber band bumps against the air particles and as such, generates a sound wave. The air particles then bump into nearby air particles, and the sound wave travels through the air.īlowing air through your harmonica causes the rubber band to vibrate. The vibrating object, such as a vocal cord or a violin string, bumps into air particles around it. Waves in the pool travel through water, while sound waves most commonly travel through air. a person jumping in), sound waves are generated by the vibration or rapid back-and-forth motion of an object. Much like a wave in a pool is created by a disturbance (e.g. The sounds we hear every day are sound waves traveling through the air and reaching our ears. As you moved the remaining straw, you could change the tone as the vibrating part of the rubber band became shorter or longer. With only one straw, the vibrating part of the rubber band was probably longer, vibrated slower, and generated a lower-pitch sound. When you removed all but one straw, you probably found that the pitch of the instrument became lower. The shorter section of rubber band vibrates more quickly, and our ears pick this up as a higher-pitch sound. When you moved Straws 2 and 3 closer together, the vibrating section of the rubber band got shorter and the tone of the sound got higher. In addition, you might have noticed that you could change the tone of the sound by moving the straws. From this you can observe that the large rubber band was essential to creating sound, and that vibrations accompanied the sound. When you rebuilt the instrument without the large rubber band, you probably found that you could not produce any sound when you blew through it. As you blew through your instrument, you might have noticed that you could feel the vibrations through the craft stick. The sound made by your instrument is actually the sound created by the large rubber band vibrating as you blow through it, just as a violin string vibrates when played by a violinist. Can you make a sound? If so, is the sound different than the other times you played it? Do the craft sticks vibrate or feel different when you blow through it?
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