How many photons/sec does it receive from the man

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A drone, flying 300m above ground, observes a man walking on a road in a cold night (0°C). Assume that the camera on board in sensitive to radiation at wavelength 10mm (±5%) and has a collecting lens of diameter 10 cm, how many photons/sec does it receive from the man and from a similar surface of road?

Reference no: EM13245605

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