undulatory
a . 波动的,起伏的,起浪的
波动的,起伏的,起浪的
undulatory adj 1 :
resembling waves in form or outline or motion [
synonym :
{
undulatory }, {
undulant }]
Undulatory \
Un "
du *
la *
to *
ry \ (?;
277 ),
a . [
Cf .
F .
ondulatoire .]
Moving in the manner of undulations ,
or waves ;
resembling the motion of waves ,
which successively rise or swell rise or swell and fall ;
pertaining to a propagated alternating motion ,
similar to that of waves .
[
1913 Webster ]
{
Undulatory theory },
or {
Wave theory } (
of light ) (
Opt .),
that theory which regards the various phenomena of light as due to undulations in an ethereal medium ,
propagated from the radiant with immense ,
but measurable ,
velocities ,
and producing different impressions on the retina according to their amplitude and frequency ,
the sensation of brightness depending on the former ,
that of color on the latter .
The undulations are supposed to take place ,
not in the direction of propagation ,
as in the air waves constituting sound ,
but transversely ,
and the various phenomena of refraction ,
polarization ,
interference ,
etc .,
are attributable to the different affections of these undulations in different circumstances of propagation .
It is computed that the frequency of the undulations corresponding to the several colors of the spectrum ranges from 458 millions of millions per second for the extreme red ray ,
to 727 millions of millions for the extreme violet ,
and their lengths for the same colors ,
from the thirty -
eight thousandth to the sixty thousandth part of an inch .
The theory of ethereal undulations is applicable not only to the phenomena of light ,
but also to those of heat .
[
1913 Webster ]
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