Conversation takes place at around 40 decibels,a subway train is about 80 decibels,and a rock concert is from 80 to 100 decibels.

• 人交谈的声音强度一般为40分贝，地铁的噪音强度约为80分贝，摇滚音乐会声音强度在80到100分贝之间。