At the race track, one race car starts its engine with a resulting intensity level of 104.0 db at point p. then 6 more cars start their engines. if the other 6 cars each produce the same intensity level at point p as the first car, what is the new intensity level with all 7 cars running?

To solve the problem it is necessary to apply the concepts related to sound intensity. The most common approach to sound intensity measurement is to use the decibel scale:

Where,

is a reference intensity. It is the lowest or threshold intensity of sound a person with normal hearing can perceive at a frequency of 1000 Hz.

I = Sound intensity

Our values are given by,

For each auto the intensity would be,

Therefore the sound intesity for the 7 autos is

The sound level for the 7 cars in dB is

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

where is the