比40分贝的声音响度大1000倍的声音响度是多少？

分贝数=10log(VAL/REF)^2 其中val为实际值，ref为参考值

所以40dB则意味着：40db=20log(val/ref)

比40分贝大1000倍，则a=20log(1000val/ref)=20[log(1000)+log(val/ref)]=60+20log(val/ref)=100dB

简单地理解，即声音响度每增加10倍，分贝值增加20dB

ANSWER:

1000 times is the cubic of 10-fold.

For a sound, when it becomes 10 times louder than before, 20dB more were added to its intensity. So the intensity of a sound will become 40+20+20+20=100dB.

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