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PhysicsNEET 2020Photoelectric effect and Einstein's equation

Dual Nature of Radiation and Matter

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

  1. A.10×10310 \times 10^3 J
  2. B.12×10312 \times 10^3 J
  3. C.24×10324 \times 10^3 J✓
  4. D.48×10348 \times 10^3 J

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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