1 分貝的單位是 A 還是 dB 呢?
2 咁分貝的單位 (A/dB) 又係點解呀?
急（聽日要知啦！）～～～噪音問題（好容易，10分）
2007-04-12 3:57 am
回答 (2)
2007-04-12 2:01 pm
✔ 最佳答案
分貝(聲強級)是聲音強度的單位，常用dB表示 。「分」指十倍，個位是「貝」，但一般只採用分貝。
以「密度」(功率每「距能量源作半徑之圓球面積」)來計算
即分貝是以每一立方米的空氣所帶有的聲能作標準,再使用'log'的計算簡化而成的單位
參考: 自己
2007-04-12 4:05 am
dB (decibel) is itself a unit for sound level.
db = 10.log(I/I0)
where I is the intensity of sound, and
Io is the threshold of hearing, which is 10^-12 W/m2
2007-04-11 20:06:28 補充：
Threshold of hearing is the lowest intensity of sound that a human ear can hear.
db = 10.log(I/I0)
where I is the intensity of sound, and
Io is the threshold of hearing, which is 10^-12 W/m2
2007-04-11 20:06:28 補充：
Threshold of hearing is the lowest intensity of sound that a human ear can hear.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070411000051KK05197