Light with an energy flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm2, the momentum delivered (for complete absorption) during 30 minutes is:
1. 36×10−5 kg-m/s
2. 36×10−4 kg-m/s
3. 108×104 kg-m/s
4. 1.08×107 kg-m/s
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