They say that non-metals are non -sonorous (does not produce sound).
But wind produces the sound, where air (a mixture of non metals.) under pressure produces a "hooooooooo" sound.
So does this make an exception in the properties of non-metals?

Dear student, 
Metals when struck produce a distinct loud sound unlike wind where the source of sound is due to friction between the wind and the object which comes in contact. 
Regards

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