A beam of light A has twice the wavelength but the same intensity as a beam B. T

Question

A beam of light A has twice the wavelength but the same intensity as a beam B. The number of photons that hit a given area in a given time, when illuminated by beam B is:

a. the same as the number that hit when the area is illuminated by beam A. b. one-quarter the number that hit when the area is illuminated by beam A. c. twice the number that hit when the area is illuminated by beam A. d. four times the number that hit when the area is illuminated by beam A. e. one-half the number that hit when the area is illuminated by beam A.
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Explanation / Answer

e

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