## Sound Energy

Discussions on introductory science topics. Ask simple or beginner questions and expect clear and level answers.

### Sound Energy

1.Why do a cup with lesser water produce a lower pitch sound when hit with a stick as compared to a cup with more water?

2. Is sound produced by the vibration of air particles?
ScienceFreako
Forum Neophyte

Posts: 9
Joined: 08 Jul 2011

### Re: Sound Energy

Open this,

http://www.physics.smu.edu/~olness/www/ ... waves.html

Change the radio buttons to one end closed.

Vary the length of the tube and see what happens to the wavelength (thus frequency).

Remember that the speed of sound in most materials is about constant for various physical arrangements.
Resident Expert

Posts: 5924
Joined: 31 Dec 2008

### Re: Sound Energy

http://www.physics.smu.edu/~olness/www/05fall1320/applet/pipe-waves.html

Change the radio buttons to one end closed.

Vary the length of the tube and see what happens to the wavelength (thus frequency).

Remember that the speed of sound in most materials is about constant for various physical arrangements.

Thanks for your help. So i guess is the lesser amount of water, the more the wavelength is thus lower pitch sound is produced?
ScienceFreako
Forum Neophyte

Posts: 9
Joined: 08 Jul 2011

### Re: Sound Energy

ScienceFreako wrote:

http://www.physics.smu.edu/~olness/www/ ... waves.html

Change the radio buttons to one end closed.

Vary the length of the tube and see what happens to the wavelength (thus frequency).

Remember that the speed of sound in most materials is about constant for various physical arrangements.

Thanks for your help. So i guess is the lesser amount of water, the more the wavelength is thus lower pitch sound is produced?

You got it!

Now take an empty plastic milk jug and put it under a water faucet so that it fills quickly. Listen to the pitch of the sound, putting your ear as close to the mouth of the jug as you can without getting wet.