Activity 17.13.1. Intensity to Loudness.
How loud is a noise that has an intensity of \(I = 100 I_0\text{?}\)
Section 17.13 Intensity Patterns
Subsubsection Warm-up Activities
Activity 17.13.2. Speaking to a Friend.
Speaking to your friend involves sound at about 60 dB. How much bigger is the intensity of a sound at 80 dB?
Activity 17.13.3. The Vacuum Cleaner.
If a vacuum cleaner makes a sound of 75 dB from a distance of 1 m away, how far away must you stand from the vacuum cleaner for the sound to drop to a level of 25 dB (a whisper)?
Subsubsection Intensity Pattern Activities
Activity 17.13.4. Sound Detectors.
A source produces a sound with power P. It sits across from a wall of sound detectors a distance \(L\) away, as shown below. The sound detectors are separated from each other by a distance \(s\text{.}\)
(a)
Which speaker(s) will detect the loudest sound?
(b)
Which speaker(s) will detect the faintest sound?
(c)
Determine a symbolic expression for the intensity of the sound at point A.
(d)
What if the wall was made up of an infinite number of detectors? What would a graph of the intensity vs. vertical position look like?
