railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Air and Noise Pollution

दो स्वतंत्र स्रोतों द्वारा उत्पन्न 81 dB और 90 dB के दो शोर स्तरों का परिणामी क्या होगा?

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