How Does a Tuning-fork Work?
A tuning-fork vibrates to give a musical note of definite pitch or frequency and is marked on the fork by a letter or symbol referring to it
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Vibration
Why Do Cats Purr?
Why Do Cats Purr? Most people think that cats purr to show pleasure or contentment. Purring is a kind of low continuous rattling hum, but it
Who Invented the Quartz Clock?
Who Invented the Quartz Clock? In 1927, Canadian-born Warren Marrison, a telecommunications engineer, was searching for reliable frequency s
How Come Everyone Has a Unique Voice?
How Come Everyone Has a Unique Voice? Your voice identifies you as uniquely as your looks do. Although some people might sound quite a bit a
How Do We Hear Sounds?
How Do We Hear Sounds? When sounds are made, they set up movements in the air. These movements are called sound waves. The cup-like shape of