# What is the electric field amplitude 2m from the source

1. Homework Statement
A 60 W monochromatic point source is radiating equally in all diresctions in a vacum. What is the electric field amplitude 2m from the source.

2. Homework Equations
Intensity=Power/(4*Pi*r^2), Intensity proportional to square Amplitude

3. The Attempt at a Solution
I=1.19 Wm-2 what happens next?

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Meir Achuz
Homework Helper
Gold Member
Use I=(1/2)\epsilonzero c E^2.

Desperate semi related question. If you have a graph of log intensity against log of (voltage across an LDR in a potential divider circuit)
how do you explain the relationship if your resultant is a straight line of -1.7 obviously in the form of y=mx+c
Log(y)= nlog(x) + logm where y is intensity and x is voltage n being -1.7 and logm being y intercept.
im trying to explain the relationship between the two quantities and ... im stuck if anyone can help me i would very much appreciate it...

cristo
Staff Emeritus