The sail should be reflective in solar sail aircraft, which uses the energy and momentum of sunlight for propulsion.
Because in this instance the momentum transferred to the sail per unit area per time is greater than, the sail should be reflective. The equation provides the radiation pressure of the wave that completely absorbed:
Pab = I/C
While the radiation pressure of the wave that totally reflected is given by the following equation:
Pref = 2I/C
Hence, the pressure due to the radiation of reflection larger than for absorbing. Therefore, the sail should be reflective.
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