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Question

The sensor is exposed for 0.1s to a 200W lamp 10m away. The sensor has opening that is 20mm in a diameter. How many photons enter the sensor if the wavelength of light is 600mm? (assume that all the energy of the lamp is given off as light).

A
1.53×1011
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B
1.53×102
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C
1.53×104
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D
1.53×1013
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