Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

दो स्वतंत्र स्रोतों से सृजित 81 dB और 90 dB के ध्वनि स्तरों का परिणाम क्या होगा?

1
∼ 96 dB
2
∼ 91 dB
3
∼ 98 dB
4
∼ 118 dB
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