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NEET PhysicsEasy

Light with an average flux of 20 W/cm220 \text{ W/cm}^2 falls on a non-reflecting surface at normal incidence having surface area 20 cm220 \text{ cm}^2. The energy received by the surface during time span of 1 minute is :

1

10×103 J10 \times 10^3 \text{ J}

2

12×103 J12 \times 10^3 \text{ J}

3

24×103 J24 \times 10^3 \text{ J}

4

48×103 J48 \times 10^3 \text{ J}

Step-by-Step Solution

Energy received = Intensity ×\times Area ×\times Time. Given Intensity = 20 W/cm220 \text{ W/cm}^2, Area = 20 cm220 \text{ cm}^2, Time = 1 minute = 60 seconds. Energy = 20×20×60=24000 J=24×103 J20 \times 20 \times 60 = 24000 \text{ J} = 24 \times 10^3 \text{ J}.

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