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  4. Light with an average flux of 20 Ω/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :

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Q. Light with an average flux of $20\,\Omega/cm^2$ 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 :

NEETNEET 2020Dual Nature of Radiation and Matter

Solution:

Energy received = Intensity $\times$ Area $\times$ Time
$I=\frac{E}{A}$
$E=IAt$
$=\frac{20}{10^{-4}}\times 20\times 10^{-4}\times 60$
$=24 \times 10^{3}\,J$