Light with an average flux of 20 W/cm 2 falls on a non-reflecting surface at normal incidence having surface area 20 cm 2 . The energy received by the surface during time span of 1 minute is :

1. A. 12 10 3 J
2. B. 24 10 3 J
3. C. 48 10 3 J
4. D. 10 10 3 J

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