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Minor Versionm

by Procheta Mallik


Fix given balloon on the mouth of a plastic bottle. Cut the bottle into 1/3rd. Cut the other end of the balloon and insert given straw piece. Now blow through the straw into the balloon to make sound.

  1. Take a balloon.
    • Take a balloon.

    • Fold it in half so that you have a pointed tip at the bottom as shown in the figure

    • Make a fine cut of about 3 mm from the bottom

  2. The cut will leave a diamond  shaped hole at the bottom.
    • The cut will leave a diamond shaped hole at the bottom.

    • The size of the hole should be "just" enough for the straw piece that is to be inserted through the hole.

    • Cut the bottle in half or one third using a paper cutter and/or scissor.

    • Stretch the mouth of the balloon and place it over the mouth of the bottle.

    • Ensure that the mouth of the balloon is firmly fixed over mouth of bottle and is air-tight.

    • Insert one end of the straw piece through the hole made at the bottom

    • Secure the end of straw piece and balloon with rubber band.

    • The rubber band must be tied firmly such that no air escapes through the balloon-straw interface.

    • Blow hard through the straw piece to hear the loud trumpet sound.

    • The straw piece should be lower than that of bottle mouth for the bugle to work.

    • The level of straw piece is higher than that of bottle mouth.

    • Balloon is not stretched enough while blowing.

    • Not blowing hard enough

    • Rubber bands too loose

    • Stretch the balloon and blow through it at different lengths, Describe how does the sound differ?

    • Use a frequency measuring app available on App store/Play store and measure the frequency range of the sound produced.

    • What sort of energy conversion takes place when you blow ?

Finish Line

Kailash NR

Member since: 05/02/2017

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