What Is the Maximum Electric Field from a 100W Light Bulb at 1 Meter?

[sgoeke]

Homework Statement

What is the maximum value of the electric field E at 1.0 m from a 100 W light bulb radiating in all directions?

Homework Equations

I feel like I should use this equation: I=(1/2)(8.85x10^-12)(c)E^2

The Attempt at a Solution

When I used that equation, I didn't get the right answer. But I guess I'm confused since intensity is W/m^2 and we're not given the unit area.

 

[berkeman]

Homework Statement

What is the maximum value of the electric field E at 1.0 m from a 100 W light bulb radiating in all directions?

Homework Equations

I feel like I should use this equation: I=(1/2)(8.85x10^-12)(c)E^2

The Attempt at a Solution

When I used that equation, I didn't get the right answer. But I guess I'm confused since intensity is W/m^2 and we're not given the unit area.

You have 100W of light going through the surface area of a sphere that has a radius of 1 meter...