state gov TSPSC Polytechnic Lecturer Mock Test 2022 Environmental Engineering Air and Noise Pollution
What will be the resultant decibel level when there are 4 sources making noise of equal levels?
1
Decibel levels will remain the same
2
Decibel level will increase by 4 decibels
3
Decibel level will increase by 6 decibels
4
Decibel level will increase by 8 decibels