Mother Na­ture is just whistling in the wind

Truro Daily News - - WEATHER -

Last week­end, most At­lantic Cana­di­ans got to feel the wind, but how many of you took a mo­ment to lis­ten to it? Depend­ing on the rush of the wind and the shape of what it’s rush­ing over, the wind can moan, scream or sing. Sound orig­i­nates as a vi­brat­ing ob­ject, whether it’s a vi­olin string, vo­cal cords or a flag on a pole. The sound is car­ried to you by os­cil­lat­ing air mol­e­cules and pres­sure waves, which in turn set your eardrum vi­brat­ing. These vi­bra­tions move through the air and make your eardrums vi­brate at fre­quen­cies that your brain can break­down into par­tic­u­lar sounds.

Trees, for ex­am­ple, are nat­u­ral in­stru­ments for the wind to play. As the wind passes through and around their branches and leaves, these move back and forth, cre­at­ing vi­bra­tions in the air, known as lon­gi­tu­di­nal pres­sure waves. The faster an ob­ject vi­brates, the higher the pitch will be. When you think of the wind pass­ing by all sorts of ob­jects on the face of the Earth, there’s no limit to the Ae­o­lian sounds it can cre­ate. The next time you’re out­side on a windy day, take some time to lis­ten closely to the mag­i­cal sounds the wind makes.

At­lantic Cana­di­ans are no strangers to wind. It can of­fer re­lief from the swel­ter­ing sum­mer heat, cause white­out con­di­tions in the win­ter and send waves crash­ing on­shore, but did you ever stop to lis­ten to it? I’m sure there was quite a roar last Satur­day when Lynn Win­field snapped this photo at Sandy Point near Shel­burne, N.S.

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