Resistivity measurements on the leaves of corn plants are a good way to assess s

Question

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.3 M measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.9 cm and is 0.20 mm thick.

Part A

What is the resistivity of the leaf tissue?
Express your answer to two significant figures and include the appropriate units.
=________

Part B
Is this greater than or less than the resistivity of muscle tissue in the human body?
(A) greater or
(B) less

I ended up getting 58 M(omega) but it's still wrong and i don't know what i did wrong.

Explanation / Answer

The electrical resistance is given by

R = (p * L)/A
Substituing Values,
2.3 * 10^6 = (p * 0.2) / (2.9*0.2* 10^-5)
p = 66.7 m

In two sig Figure,
p = 67 m

(B)
Less
Muscle tissue resistivity = 2*10^4 m

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