The wave that creates the sound of a standard whistle oscillates at a relatively high frequency, so the resulting sound is very high-pitched. Your brain’s perception of pitch relies on how many of these compression changes your eardrum senses per second. The higher the frequency at which a sound wave oscillates, the higher the resulting sound’s pitch you hear when that wave hits your eardrums. Sound is made of pressure waves that oscillate, or alternate, between compressing and stretching the medium, or matter, they travel through (in our case, air) at a certain frequency, or rate. We’ll also explore the biological basis behind why some listeners can hear it easily, whereas others perceive only silence. In this experiment we’ll find out which volunteers are able to hear this sound frequency. Students with the ringtone can receive text message notifications during class without many teachers or administrators suspecting a thing. Teens are effectively driven away, but many adults can’t hear this sound at all! Things got even more interesting when some kids realized they could turn this technology on their elders by making the sound into a ringtone.
Some security companies recently began manufacturing machines designed to emit an annoying sound that prevents teenagers from loitering outside stores and shops.
But does hearing loss cause everything to sound uniformly softer or do certain sounds become harder to hear than others? Ever wonder why some adults experience trouble with hearing as they get older? Hearing loss tends to become more severe as we age.
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