The number of photons per second passing a plane perpendicular to a collimated monochromatic (one frequency) beam of light transporting power P is directly proportional to:
A) the wavelength of the light.
B) the frequency of the light.
C) the power of the beam.
D) increase the wavelength, frequency and power..
E) increase the wavelength and power but not the frequency.
Correct Answer:
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