Go Back   Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

Waves and Sound Waves and Sound Physics Help Forum

LinkBack Thread Tools Display Modes
Old Feb 3rd 2018, 03:15 PM   #1
Junior Member
Join Date: Feb 2018
Posts: 2
Exclamation Speed of sound in water

For a science project, I need to measure the speed of sound in water. Obviously, I don't have any fancy equipment to do this so I came up with a set up I'm not sure will work:

I have a PVC cut to 29.8 cm long. I attached two thin pieces of glass (a screen cover for a phone) on each end to seal the tube, and filled it up with water. There's a wire leading to a speaker inside the tube, and the speaker's in a plastic bag to keep it from getting wet. I also have a frequency generator attached to the speaker.

The idea was to increase the frequency the speaker produces until a standing wave is created. Ideally, the sound wave inside the tube will reflect off the air outside the ends of the tube. At the right frequency (and wavelength), the reflected waves will line up with the incoming waves from the speaker, producing a standing wave and a spike in amplitude. I have a decibel meter to measure the amplitude of the waves being created. Once I have the standing wave, I'll know the wavelength of the wave (the fundamental will be 0.596 m), the frequency, and thus the speed of sound. (Ideally)

Things aren't going as planned, and I wanted to know if it was because of accuracy of the frequency generator and decibel meter I'm using, or because the whole idea is just incorrect. Help?
jhutch is offline   Reply With Quote

  Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

sound, speed, water

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
An unorthodox Speed vs Time to Speed vs Distance question kegz91 General Physics 4 Dec 13th 2017 07:08 PM
Relation Between Density of Water and Flow Speed campbell9035 Thermodynamics and Fluid Mechanics 4 Feb 15th 2017 05:01 PM
sound of falling water and bucket Nousher Waves and Sound 2 Dec 21st 2015 02:09 PM
Time Dilation (where C=speed of sound) wordsworm Special and General Relativity 15 Jun 30th 2014 01:13 PM
Linear Speed? Angular Speed? Centripetal Acceleration? sadistprincess Periodic and Circular Motion 1 Oct 3rd 2013 06:02 AM

Facebook Twitter Google+ RSS Feed