Estimate the radiation pressure due to a bulb that emits 25 W of EM radiation at

Question

Estimate the radiation pressure due to a bulb that emits 25 W of EM radiation at a distance of 8.5cm from the center of the bulb. Assume that light is completely absorbed. Express your answer to two significant figures and include the appropriate units.
Estimate the force exerted on a fingertip at this point. Suppose that the area of the fingertip is 1.4cm2 . Assume that light is completely absorbed. Express your answer to two significant figures and include the appropriate units. Estimate the radiation pressure due to a bulb that emits 25 W of EM radiation at a distance of 8.5cm from the center of the bulb. Assume that light is completely absorbed. Express your answer to two significant figures and include the appropriate units.
Estimate the force exerted on a fingertip at this point. Suppose that the area of the fingertip is 1.4cm2 . Assume that light is completely absorbed. Express your answer to two significant figures and include the appropriate units. Estimate the force exerted on a fingertip at this point. Suppose that the area of the fingertip is 1.4cm2 . Assume that light is completely absorbed. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

I = power/area = 25/4*3.14* 0.085*0.085 = 275.49 Watt/m^2

so Rad pressure P = I/C = 275.49/3e8 =9.18 *10^-7 pa

b. force F = PA = 9.18 10^-7 * 1.4*10-4 = 1.285*10^-10 N

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