A Radiation Detector Exposed to Sunlight Records the Energy Falling

A radiation detector exposed to sunlight records the energy falling on a given area each unit time. If such a detector has a reading of 0.698 cal cm-2 min-1, how many photons of sunlight are striking each cm2 in one minute? Assume the average wavelength of sunlight is 460. nm. (4.184 J = 1 calorie)

A) 1.62 × 10¹⁸ photons
B) 4.32 × 10¹⁹ photons
C) 6.76 × 10¹⁸ photons
D) 2.31 × 10¹⁸ photons
E) 9.63 × 10¹⁹ photons

Correct Answer:

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