Answer:
The decibel level of this second sound is 48.021 decibels.
Explanation:
The acoustic intensity (
), measured in decibels, is defined by the following formula:
(1)
Where:
- Reference sound intensity, measured in watts per square meter.
- Real sound intensity, measured in watts per square meter.
If we know that
and
, then the real sound intensity of the first sound is:





The real sound intensity of the second sound is four times greater, that is:
If we know that
and
, then the acoustic intensity of the second sound is:



The decibel level of this second sound is 48.021 decibels.