I was wondering if you would be able to help me with this question: A) You are t

Question

I was wondering if you would be able to help me with this question:

A) You are to perform an E-M survey (using a vertical dipole configuration with coil spacing of 20m) over ground that is thought to have a relatively uniform resistivity of ~100 m. The anomalies you are seeking to detect could be as deep as 10m. What is the approximate maximum frequency that should be used to detect them and, very briefly, how did you arrive at this figure?

B) You are to perform an E-M survey (using a vertical dipole configuration with coil spacing of 20m) over ground that is thought to have a relatively uniform resistivity of ~100 m. The anomalies you are seeking to detect could be as deep as 10m. What is the approximate maximum frequency that should be used to detect them and, very briefly, how did you arrive at this figure?

I need the answer as soon as possible.
Thank you

Explanation / Answer

Maximum frequency is given by:

depth=503 x (conductivity/frequency)1/2

10 = 503 x (100/frequency)1/2

0.01988= 10/(frequency)1/2

frequency1/2 = 10/0.01988

frequency = (503)2

frequency = 253009 hertz

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