Problem 34.44 Assume that a 7.0-cm-diameter, 150 W light bulb radiates all its e

Question

Problem 34.44 Assume that a 7.0-cm-diameter, 150 W light bulb radiates all its energy as a single wavelength of visible light. Part A Estimate the electric field strength at the surface of the bulb. Express your answer to two significant figures and include the appropriate units. E Value Units Submit My Answers Give Up Part B Estimate the magnetic field strength at the surface of the bulb. Express your answer to two significant figures and include the appropriate units. B-Value Units Submit My Answers Give Up Pr

Explanation / Answer

a) E = sqrt(2I/(eo*c))

I is the intensity of light

eo is the permitivity of free space

c is the speed of light

I = P/(4*pi*r^2) = 150/(4*3.142*(3.5*10^-2)^2) = 9743 W/m^2

then

E = sqrt(2*9743/(8.85*10^-12*3*10^8)) = 2709.12 V/m

B) B = E/c = 2709.12/(3*10^8) = 9*10^-6 T

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