An organ pipe is 3 meters long. What is the frequency of sound it produces?
You need to know more information before this question can be answered. Organ pipes come in several different types, firstly there are ‘flue pipes’ which are like overgrown penny whistles, then there are ‘reed pipes’ which are more like oboes, clarinets, saxophones, etc – they have reeds which make the sound. This question is probably about a flue pipe. These come in 2 different subtypes – open, and stopped. Open pipes are open at both ends, and contain a half-wavelength (approximately) of a sound wave when speaking, with a pressure antinode in the middle, and a node at both ends. Stopped pipes are closed at the top end, and contain a quarter wave. There is a pressure antinode at the closed end and a node at the bottom end where the mouth is. Then you need to know what gas is in the pipe and what the speed of sound in that gas is. Perhaps this is air at normal pressure. The speed of sound in air at sea level = 340.29 m /s. Now, having made these assumptions, we can use the formula freq
