A sound measures 42 dB. The intensity of a second sound is four times as great. What is the decibel level of this second sound?

The decibel level of this second sound is 48.021 decibels.

Step-by-step 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.

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last graph i believe

step-by-step explanation:

worked it out i believe