Environmental Science
How do red and blue light differ?

The wavelength of red light is longer.
Blue light has a higher speed of propagation.
Red light has a higher intensity.
Red and blue light have different directions of polarization.

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Environmental Science
During the winter solstice in the Northern Hemisphere:

All of these
The noon sun is overhead at 23.5o S latitude
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
Astronomical winter begins in the Northern Hemisphere

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