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.
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Answer:
In case of perfectly non reflecting surface,
Δp=E/c
where
e=20×30×30×60
=1.08×106j
Δp=1.08×10^6/3×10^8
36×10^−4kg−m/s.
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Answer:
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 .
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