A person has a hearing threshold 10 dB above normal at 100 Hz and 50 dB above normal at Hz. How many times more intense must a 100-Hz tone be than a -Hz tone if they are both barely audible to this person?
Ultrasound of intensity W/m2 is produced by the rectangular head of a medical imaging device measuring 4.00 cm by 7.00 cm. What is its power output?
What is the sound intensity level produced by earphones that create an intensity of W/m2?