The amplitude of a sound wave is the degree of motion of air molecules within the wave, which corresponds to the changes in air pressure that accompany the wave. The greater the amplitude of the wave, the harder the molecules strike the eardrum and the louder the sound that is perceived.
- amplitude [ˈæmplitju:d] n. 振幅
- accompany [əˈkʌmpəni] v. 伴随
- strike [straik] v. 击打
- eardrum [ˈiədrʌm] n. 耳膜
- perceive [pəˈsi:v] v. 感到
