Resistivity measurements on the leaves of com plants are a good way to assess st

Question

Resistivity measurements on the leaves of com plants are a good way to assess stress and overall health the leaf of a com plant has a resistance of 2 2 M Ohm measured between two electrodes placed 20 cm apart along the leaf the leaf has a width of 2 5 cm and is 0 20 mm thick You may want to review What is the resistivity of the leaf tissue? Express your answer to two significant figures and include the appropriate units. Is this greater than or less than the resistivity of muscle tissue in the human body?

Explanation / Answer

area

A=0.025*0.2*10-3=5*10-6m2

Resistance is given by

R=pL/A

resistivity is

p=RA/L=(2.2*106)*(5*10-6)/0.2

p=55 ohm-m

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