How many photons strike the detector per second

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Reference no: EM131392528

1. Suppose a 700-nm beam with a power of 0.2 mW and a 5-cm diameter strikes a detector with a 0.2-cm diameter. How many photons strike the detector per second?

2. A detector can just resolve a light intensity of . How far away can it be placed from a 10-W point source?

Reference no: EM131392528

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