Science Projects And Inventions

YOU NEED:

• A balloon

Your vocal cords in your throat produce voice and your speech. When they are close together you tone sounds high and when their gap increases your tone becomes gruff.

Let’s try one experiment to prove this. Take a balloon and inflate it fully:  now hold it with your fingers pinching the neck of the balloon.

You will hear a shrill note coming out. Next start making the aperture gap bigger and bigger and you will hear the note getting more and more low as the  air escapes.