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PRACTICE / Radiation pressure

Light exerts a pressure

A beam of intensity 600 W/m² strikes a perfectly absorbing surface normally in vacuum.

Find its radiation pressure.

Organize the givens & assumptions
  • I = 600 W/m²
  • c = 3×10⁸ m/s

Normal incidence in vacuum, complete absorption and no reflected beam; c = 3 × 10⁸ m/s.

  1. A4×10−6 Pa4\times10^{-6}\ \mathrm{Pa}
  2. B0 Pa0\ \mathrm{Pa}
  3. C600 Pa600\ \mathrm{Pa}
  4. D2×10−6 Pa2\times10^{-6}\ \mathrm{Pa}

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