Fysici
Ernst
Chladni (1756-1827) |
| German
physicist known as the father of acoustics. He set plates covered
with a thin layer of sand vibrating and observed nodal lines. He calculated
the velocity of sound by filling an organ pipe with different gases
and listening to the frequency. In his investigations, he showed that
the obliquity of fibers in the Scotch fir made the speed of sound
20% lower in the cross direction. He was also a meteorite enthusiast.
He wrote a book on the subject and assembled his own collection. He
was one of the first people to claim that meteorites fell from the
sky. © 1995-2000 Eric W. Weisstein |
|
