The evening sunsets are reddish orange because the atmosphere

A. absorbs blue light.
B. is more efficient at scattering blue light.
C. contains small amounts of red dust that give the air its red color.
D. absorbs the red light.
E. is most efficient at scattering red light.


Answer: B

Physics & Space Science

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A distance R away from a light source we observe which of the following for the electromagnetic field it produces?

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A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm. Monochromatic light of a different wavelength is now shown on the tube, and the stopping potential is measured to be 2.30 V

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Physics & Space Science