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WAVES Unit
22 Dr. John P. Cise Professor Of Physics , Austin Com.
College , 1212 Rio Grande St., Austin Tx
For Mating Mosquitoes, ‘Harmonic
Convergence’
A mosquito may not be
anyone’s idea of a hopeless romantic, but the insect does produce a l=
ove
song of sorts — the whine of its beating wings, resonating in a part =
of
the body called the thoracic box. A female’s whine, at a fundamental =
frequency
of 300 to 600 hertz, is enough to make a male mosquito swoon. Skip to n=
ext
paragraphDr.
Hoy said both males and females raise their whines to about 1200 hertz(cycl=
es/sec),
which is a harmonic of the fundamental frequency of both the female (about =
400)
and male (about 600). It=
’s
the first time that such “harmonic convergence” has been shown =
to
occur.He noted that the finding also disproved what scientists had long
believed — that mosquitoes can’t hear above a certain frequency.
“We all believed the ceiling to be 800 to 1000 hertz,” he said.=
Dr.
Hoy said the behavior was probably a part of the sexual selection process.
“Females are particularly picky,” he said. “A female is g=
oing
to require of a courting male that he be able to match her flight tone.R=
21;
Introduction: Think the waves generated by male =
and
female mosquitoes’ as similar to harmonic standing waves on strings. =
The
first harmonic frequency is the fundamental frequency. The second harmonic =
is
twice the frequency of the fundamental frequency. The third harmonic is thr=
ee
times the frequency of the fundamental frequency. Questions: (a) Sketch the
first three harmonic standing waves of female mosquitoes? (b) Give the first
three harmonic frequencies of a female mosquito? (c) Sketch the first two
harmonic standing waves of a male mosquito? (d) Give the first two harmonic
frequencies for the male mosquito? Which harmonic frequencies (first, secon=
d, third,
fourth, etc) of the male and female mosquitoes are equal to the 1200 hertz =
needed
for proper mating?
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