Questions
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
detailed solution
Correct option is B
The total energy falling on the surface isU=IAt=20 Wcm2 x 30 cm2 x 30 x 60 sec= 20 x 30 x 1800 jouleTotal momentum delivered (for complete absorption)P=UC=20 x 30 x 18003 x 108= 36 x 10-4 kg m / sTalk to our academic expert!
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