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Light with an average flux of 20 W/(cm)^...

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:

A

` 10 x 10^3 J`

B

` 12 x 10^3 J`

C

` 24 x 10^3 J`

D

` 48 x 10^3 J`

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