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| Q.19 | While raising a barrier wall between noise source and noise receiving end to reduce noise level at the receiving end, the noise reduction in decibel: | |
| Ans | 1. is directly proportional to the wavelength of sound | |
| 2. is directly proportional to the distance between the barrier and the receiving end | ||
| 3. depends on the height of the barrier wall | ||
| 4. does not follow a logarithmic function |
Correct Ans: 3
