An object emits sound. The same amount of energy transfers through the blue patch as through the red patch. The area of the red patch is four times the area of the blue patch. How many times the area of the blue patch is the area of the patch within the solid green lines?
Identical disks oscillate with equal amplitudes to generate sound waves. One of the disks generates waves in air and the other generates waves in water. For which color would the sound waves generated have greater intensity?
Which of the following is the approximate sound intensity, in decibels, for the sound generated by a vacuum cleaner, as heard by the person using it?