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Wave types can be divided into transverse waves and longitudinal waves, and the characteristics of sound can be explained in terms of amplitude, frequency, and waveform.

1. Wave: A periodic vibration that occurs in any part of a material and spreads around it.

2. Transverse Wave: Waves in which the direction of vibration of the medium and the direction of wave travel are perpendicular to each other

Example) Water wave, electromagnetic wave, seismic wave S wave

3. Seismic wave: A wave in which the direction of vibration of the medium and the direction of wave travel are parallel to each other Example) Sound (sound wave), seismic wave P wave

4. Wave expression (transverse wave)

Goal: where the medium is at the lowest

Wavelength: distance from floor to floor, valley to valley

Amplitude: Distance from the center of vibration to the floor or valley

Period: The time it takes for the point that used to be a floor to become a floor again in the process of propagating the wave.

Frequency: The number of times the wave vibrates in 1 second.

5. The three elements of sound

Loudness: The larger the amplitude of the wave, the louder the sound.

Sound level: The higher the frequency of the wave, the higher the sound.

Voice: Different instruments have different waveforms, so the tone is different.