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Dual Nature of Radiation and Matter question

2020 · Q146
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Dual Nature of Radiation and Matter question

2020 · Q146

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
Light with an average flux of 20 W/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 :
  1. A
    12 ×\times× 103 J
  2. B
    24 ×\times× 103 J
  3. C
    48 ×\times× 103 J
  4. D
    10 ×\times× 103 J
View written solutionFree

Correct answer: B

Energy = intensity ×\times× time ×\times× area
= 20 ×\times× 60 ×\times× 20
E = 24 ×\times× 103 J

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