UC知道请英语高手伸出援手啊 小弟谢过
来源：百度知道 编辑：UC知道 时间：2024/06/24 05:28:55
The magnitude or strength of a sound is determined by how
much the air particles are displaced from equilibrium by the
sound pressure waves. The greater the amplitude of the pressure
fluctuation, the more acoustic energy the sound wave
carries. Simply measuring the magnitude of sound on a linear
scale is not practical, however, because the range of sound
pressures which the human ear can detect is enormous—a
ratio of 1 to approximately 1014 (1 followed by 14 zeros). By
converting this ratio to a logarithmic scale, the range can be
reduced to 14 units. The unit of sound level measurement on
this scale is the bel (in honor of Alexander Graham Bell).
Normally, though, these units are divided into tenths—that is,
decibels. The range of human hearing thus extends from 0
decibels, corresponding to the faintest sound level that the
healthy, unimpaired human ear can detect, to more than 140
decibels. (Sou
much the air particles are displaced from equilibrium by the
sound pressure waves. The greater the amplitude of the pressure
fluctuation, the more acoustic energy the sound wave
carries. Simply measuring the magnitude of sound on a linear
scale is not practical, however, because the range of sound
pressures which the human ear can detect is enormous—a
ratio of 1 to approximately 1014 (1 followed by 14 zeros). By
converting this ratio to a logarithmic scale, the range can be
reduced to 14 units. The unit of sound level measurement on
this scale is the bel (in honor of Alexander Graham Bell).
Normally, though, these units are divided into tenths—that is,
decibels. The range of human hearing thus extends from 0
decibels, corresponding to the faintest sound level that the
healthy, unimpaired human ear can detect, to more than 140
decibels. (Sou
声音的巨大或力量由怎样确定 空气微粒被偏移从平衡由 酣然的压力波浪。更加伟大压力的高度 波动, 更加音响的能量声波 运载。简单地测量巨大声音在线性 标度不是实用的, 然而, 因为声音的范围 人的耳朵可能查出的压力是极大的 比1 与大约1014 年(1 被14 零跟随) 。由 转换这个比率对一个对数标度, 范围可能是 减少到14 个单位。声音强度测量单位 这个标度是贝耳(以纪念Alexander Graham Bell) 。 通常, 虽然, 这些单位被划分入tenths 是, 分贝耳。人的听力的范围因而延长从0 分贝耳, 对应于最微弱的声音强度 健康, 未受损伤的人的耳朵可能查出, 到超过140 分贝耳。(几乎200 分贝耳的声音强度是可能的 譬如在火箭里面引擎但是大于 无保护的人的耳朵可能承受。