Light with an average flux of 20 falls on a non-reflecting surface at normal incidence having surface area 20 . The energy received by the surface during time span of 1 minute is [2020]

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Solution

Q.
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 [2020]

1 $10 \times 10^{3} J$

2 $12 \times 10^{3} J$

3 $24 \times 10^{3} J$

4 $48 \times 10^{3} J$

Ans.
(3)

Energy received in 1 minute = Intensity $\times$ Area $\times$ Time

$E = (20 {W/cm}^{2}) \times (20 {cm}^{2}) \times (1 \times 60 s) = 24 \times 10^{3} J$

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