The discussion centers on calculating the electric field amplitude at a distance of 2 meters from a 60 W monochromatic point source in a vacuum. The intensity is calculated as 1.19 W/m² using the formula Intensity = Power / (4 * Pi * r²). The relationship between intensity and electric field amplitude is established through the equation I = (1/2)ε₀cE², where ε₀ is the permittivity of free space and c is the speed of light. Additionally, a secondary question regarding the logarithmic relationship between intensity and voltage across a light-dependent resistor (LDR) in a potential divider circuit is raised, specifically focusing on a linear relationship with a slope of -1.7.
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hopeless blonde said: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 ... I am stuck if anyone can help me i would very much appreciate it...