An open pipe instrument has a fundamental frequency of 15912 If y=330m/s, calculate: 1. the length of the pipe 11. Third overtone
Mention three use of an echo

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?