While the decibel scale can be used in many disciplines, we shall restrict our attention to its use in acoustics, specifically its use in measuring the intensity level of sound. The Sound Intensity Level (measured in decibels) of a sound intensity (measured in watts per square meter) is given by Compute Damage to your hearing can start with short term exposure to sound levels around 115 decibels. What intensity is needed to produce this level

I = 0.316 W/m^2

Explanation:

In order to calculate the intensity required to produce a sound level of 115 decibels, you use the following formula:

  (1)

B: sound level = 115dB

I: intensity of the sound = ?

Io: Threshold of hearing = 10^-12 W/m^2

You solve the equation (1) for I, by using properties of logarithms:

Finally, you replace the values of all parameters:

The intensity that produces a sound level of 115 dB is 0.316 W/m^2

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)