什么是混响时间RT60的定义？

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试卷: WELL AP模拟题英文D卷[查看]
什么是混响时间RT60的定义？
A: a metric which describes the length of time taken for a sound to decay by 40% from its original level
B: a metric which describes the length of time taken for a sound to decay by 60 seconds from its original level
C: a metric which describes the length of time taken for a sound to decay by 60dB from its original level
D: a metric which describes the length of time taken for a sound to decay by 60% from its original level

参考答案: C

本题解释:
选择C