Question
Download Solution PDFLight with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incident. If the surface has an area of 20 cm2, find the total momentum delivered (for complete absorption) during a 30 minute time span?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Formula:
Energy flux = Power incident/Normal Area
Momentum delivered during complete absorption at normal incidence,
p = E/c = PΔt/c
Power incident, P = Energy flux × Area
Calculations:
Given:
Energy flux = 18 W/cm2
θ = 90°
Area of the surface = 20 cm2
t = 30 minutes = 30 × 60 s
Power incident = Energy flux × Area
⇒ Power incident = 18 × 20 = 360 W
∴ Momentum delivered in 30 minutes = PΔt/c
= (360 × 30 × 60)/(3 × 108)
= 2.16 × 10-3 kg m/s
Last updated on May 26, 2025
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