The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sounds is 10^-10 watt/m^2.

the level of sound in the quiet room is (10,20, or 100) db, and the intensity of sound in the busy street is (10^-1, 10^-5, or

10^-10) wat/m^2.

use the formula b=10log(i/io) , where b is the sound level in decibels, i is the intensity of sound, and io is the smallest sound intensity that can be heard by the human ear (roughly equal to 1x10^-12 watts/m^2).