f18Sound can change according to the speed at which it travels. Another word for sound speed is pitch. When the sound speed slows, the pitch lowers. With clarinet reeds, it’s high. Guitar strings can do both, as they are adjustable. If you look carefully, you can actually see the low pitch strings vibrate back and forth, but the high pitch strings move so quickly it’s hard to see. But you can detect the effects of both with your ears.


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16 Responses to “Air Horns & Sonic BOOM!”

  1. Lisa Main says:

    We found little plastic gum containers next to the register Wal-Mart. SugarFree Mentos Gum. It’s a little red container about 3.5″ tall. Open and cut the hinge to remove the lid. It’s not a cylindrical shape, but it worked well. We’re going to be using these for all our “film cannister” needs.

  2. I know they are hard to find… I am so sorry!! I’ve had good luck with small containers, like the kind pills come in (but make sure there’s no medicine in it when you give it to your kids to use, and it’s washed out and very clean). Also some candies like mini M&Ms and minds come in containers similar to film canisters. Look in your cabinets for something that is about the same size and shape!

  3. Patricia Gulati says:

    what can you use instead of a film container since those are very difficult to find

  4. Deliese Kubie says:

    We used the same materials, but got three very different sounding horns. My daughter (the flute player) has a VERY high pitch, while I (a string bass player) have the lowest. That was a fun happenstance, but we were wondering if the relative tightness of the balloon makes a difference in the pitch. By the way, thanks for my headache! 😉

  5. You’ve got the right idea! Longer tubes make lower sounds, short make a higher pitch. Wider make lower pitch, and thinner make higher pitch.

  6. Richard Gress says:

    I think it gets higher because my brother plays the organ, and the smaller pipes make a higher pitched sound. The pipe (or straw) is vibrating at a faster frequency

  7. Good question! What are YOUR thoughts as to why this is? And by louder, do you mean volume or pitch?
    If it’s pitch, think about the difference between a flute and a piccolo. If it’s volume, how could you be sure you’re blowing the same amount each time with a different size straw?

  8. Richard Gress says:

    on the air horn experiment, i tried cutting the straw a little shorter each time. The sound seemed to be louder after i did this. Do you know why???

  9. Kaelen Davis says:

    Since the balloon experiment didn’t work, I did the “Parent -Annoyer” experiment. It worked wonder! Thanks! 🙂

  10. Kaelen Davis says:

    Thanks! I’ll try that. 🙂

  11. This can happen if you have a sharp edge on the hexnut, or are inflating the balloon too much. Try again and see what happens!

  12. Kaelen Davis says:

    Whenever I am about to get the hum, my balloon blows up.:( Am I matching my balloons frequency, or is something simpler going on? Thanks!

  13. Marta Brantley says:

    Since we didn’t have any balloon’s in the house, we substituted a latex glove

  14. Which part are you having trouble with?

  15. Robin Flores says:

    I can not get it right !