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 total momentum delivered (for complete absorption) during 30 minutes is , [NCERT Exemplar]
A. 36 × 10-5 kg m/s.
B. 36 × 10-4 kg m/s.
C. 108 × 104 kgm/s.
D. 1.08 × 107 kg m/s.
Answer:A
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 total momentum delivered (for complete absorption) during 30 minutes is , [NCERT Exemplar]
A. 36 × 10-5 kg m/s. B. 36 × 10-4 kg m/s. C. 108 × 104 kgm/s. D. 1.08 × 107 kg m/s.