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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| Question | |
C | 14 |
I | |
Question By what amount does the sound intensity decrease when the distance to the source doubles?
1) 1.4 dB
2) 2.0 dB
3) 4.0 dB
4) 6.0 dB
5) 8.6 dB | |
Answer 6.0 dB | |
Notes
| User | Added | Note | e | d |
|---|---|---|---|---|
| KillGorack | 2023-07-20 19:34:59 | When the distance to a sound source doubles, the sound intensity level decreases by 6 dB. The intensity of sound follows an inverse square law with respect to distance, so when the distance doubles, the intensity decreases to 1/4th of the original intensity (or decreases by 75%). In terms of decibels, which is a logarithmic measure, this corresponds to a decrease of 6 dB because every doubling or halving in power corresponds to a 3 dB change. Here, the power decreases by a factor of 4, which is 2 squared. So the decrease is 2*3 dB = 6 dB. Therefore, the answer is: 6.0 dB |
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