Light with an intensity of 1 kW/m² falls normally on a surface with an area of 1 cm² and is completely reflected.The force of the radiation on the surface is: A)3.3 *10^-11 N B)1.7 * 10^-10 N C)3.3 * 10^-10 N D)6.7 *10^-10 N E)1.0 * 10^-4 N

Question

Quizplus · Accepted Answer

The force exerted by radiation is given by the formula F = 2IA/c, where I is the intensity, A is the area, and c is the speed of light. Substituting the given values, F = 2 * 1000 W/m² * 1 * 10^-4 m² / (3 * 10^8 m/s) = 6.7 * 10^-10 N.

Light with an Intensity of 1 KW/m2 Falls Normally on a Surface

Light with an Intensity of 1 KW/m² Falls Normally on a Surface