Rokiya

Light with an intensity of 1kW/m2 falls normally on a surface and is completely absorbed. The radiation pressure is:

Light with an intensity of 1kW/m2 falls normally on a surface and is completely absorbed. The radiation pressure is: ​
  1. 1kPa
  2. 3×1011Pa
  3. 1.7 × 10−6 Pa
  4. 3.3 × 10−6 Pa
  5. 6.7 × 10−6 Pa
​ The answer is D, but I don't know why.
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