Option C. According to Einstein's theory, an increase in the number of photons in a beam of light C. The brightness of the beam of light increases.
Einsteins theoreyAccording to Einstein's theory, the number of photons in a beam of light does not directly affect the fundamental properties of light such as its wavelength, speed, or frequency.
These characteristics of light are determined by the source and the medium through which it travels.
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Answer: C.
The brightness of the beam of light increases.
Explanation: ed mentum or plato