Kaplan MCAT Physics Review by Kaplan

Author:Kaplan [Kaplan]
Language: eng
Format: epub, pdf
Publisher: Kaplan Test Prep
Published: 2010-08-03T04:00:00+00:00

9

Periodic Motion, Waves, and Sound

In the epic and ongoing battle between convenience store owners and marauding groups of bored teenagers, there’s a new weapon that may ultimately prove to bring victory to merchants in their quest against loitering. No, it doesn’t involve parents or truant officers. It will not cause permanent injury to either body or self-esteem. It’s nontoxic, safe, and effective, and best of all, anyone over the age of 25 is completely unaffected by it. What is it? It’s a noise machine, but not just any noise machine. This special device emits a sound whose frequency is so high, it can only be heard by young people—and they find it really, really annoying. As people get older, they lose the ability to hear these high-frequency sounds, but teenagers and even some people in their early 20s can still hear them. The device goes by the name of a particularly annoying blood-sucking insect, and the company that distributes the device throughout North America has a name that would be fitting for a pest control service.

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