Thermal emissions from the lava cause an increase
in the frequency of light surrounding the flow.
Light maintains the same wave-speed, regardless of
frequency. Therefore, we know that the
wavelength is indirectly proportional to the
frequency, and that is the frequency is increased,
the wavelength decreases.
For a certain
temperature, the frequency and wavelength will be
modified to corresponding values. We know that
the visible spectrum can be broken down into
colors, each with unique wavelengths. The
wavelength of red is from 622-780 nanometers.
Therefore, the lava glows red when the temperature
is increased to where the frequency is between 482
and 384 THz. As the frequency is increased, the
wavelength would decrease. So, theoretically,
***really*** hot lava would look orange, yellow,
green, blue and violet!! The lava is termed a
'black body radiator.' Ask your teacher what that is.
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