(2) If the speed of light is the product of wavelength and frequency,
it follows that a change must have taken place in the wavelength, frequency,
or both.
(3) Information, provided by physicists, tells us that when light
enters a medium of greater or lesser density, the frequency remains constant
and it is the wavelength that changes. Figure 1-2 illustrates this process.
Figure 1-2.
Traveling of light waves
It is difficult to accurately measure the frequency of radiant energy.
Therefore, identify it according to its wavelength in air.
Imagine the
difficulty involved in measuring ultraviolet radiation that has a frequency
of 750 trillion waves per second.
2.
a. Radiant Energy in Sequence. Arranging the various forms of radiant
energy in sequence according to wavelength forms the electromagnetic
spectrum.
Refer to figure 1-3.
It would extend from cosmic rays with
extremely short wavelengths on one end, to radio waves with extremely long
wavelengths on the other end.
1-4
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