Friday, July 15, 2011

Unit 9 Post - 7/15: Consequence of SOUND!

Sound is a longitudinal wave (meaning it moves parallel to the wave motion) that cannot be transmitted without a medium - which is why there's no sound in outer space. It's also a non-dispersive wave meaning all the waves travel at the same speed in the same medium regardless of frequency, so when you listen to music all the pitches reach your ear at the same time allowing tempo and rhythm to stay intact. At sea level this speed of sound is 340. 29 which is slower than the speed of light - meaning you will see motion happen before you hear it!

The human hearing range is from 20 Hz to about 20,000 Hz, and as you age this range decreases. Society manipulates that by instituting whistles and horns that can only be heard by younger people in order to keep them away from certain place as is in England.


When you listen to your ipod, the sound is traveling through the metal in the earphone and the air between it and your ear. This is a very short distance, thus if you listened to the same song at a stationary volume on your ipod and then through a speaker, it would sound louder on your ipod.

5 comments:

  1. iPods are great! Better than speakers. Just make sure you don't turn yours too loud. Good Post :)

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  2. This was a very accurate and thorough post, Josh. Great going!


    Btw, don't you think those "teen repellent" sounds are unethical? Basically, it causes irritation (and possibly pain) to all young 'uns who manage to hear it.

    It's a sound weapon! How wrong!

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  3. Yes, iPods are great, but ultimately I prefer speakers. And the distance between the headphones and your eardrums can ruin your hearing pretty quickly in comparison to a speaker farther away. Nice post Josh!

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  4. Great explanation and example. I'm definitely an earphone girl too. Love my own theme music wherever I go :)

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