Questions
Light with an energy flux of falls on a perfectly reflecting surface at normal incidence. If the surface area is , the average force exerted on the surface is
detailed solution
Correct option is B
Energy flux, I=25×104 W m-2 Area, A=15 cm2=15×10-4 m2 Speed of light, c=3×108 m s-1For a perfectly reflecting surface, the average force exerted on the surface isF=2IAc=2×25×104Wm-2×15×10-4 m23×108 m s-1 =250×10-8 N=2.50×10-6 NTalk to our academic expert!
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A photon and an electron possess same de-Broglie wavelength. Given that c is speed of light and v, the speed of electrons, which of the following relations is correct ? Here = K.E. of electron, = K.E. of photon, = momentum of electron, = momentum of photon
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