व्हिच यूनिट इज यूज टू मेजर लेवल ऑफ नॉइस
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व्हिच यूनिट इज यूज टू मेजर लेवल ऑफ नॉइस
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Answer:
first it is not noise it is voice and unit is decibal
Explanation:
its the "decibal"