A bit of fun for a sound/ hearing topic. the ASE has an activity about the high-pitched teenager-repellent noise that is being placed outside many public places to ward off antisocial behaviour. The device emits a sound that is only audible to those whose hearing remains completely intact, i.e. the under 25-ishes.

This clip from CNN UK could be used as an opener:

The activity centres around a radio or TV programme in which different points of view and ethical standpoints are addressed. “Hoodies have feelings too, you know!”

If you want to test your hearing, get on a decent pair of headphones and check out the University of New South Wales‘ Equal Loudness Contours and Audiometry activity.

Some more about sound after the jump.

Here’s a Sonic Boom:

And here’s the Doppler Effect in action: