A tanker truck carrying liquid herbicide overturned and caused a spill over a field. The liquid herbicide remained on the soil for 30 minutes before evaporating into the air. The mass diffusivity of the liquid herbicide in the soil is 2 × 10–8m2/s. If a concentration of 0.1% by weight will destroy most life, determine the depth of the soil at which plant and insect life is likely to be affected by the spill. Answer: 2.80 cm
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