C.0.3. Calculate the value of this limiting speed for a grain of corn pollen, given that g = 9.8 m.s-2, that the air viscosity is 1.8x10-5 Pa.s at 25 °C, that the mean radius of a grain of pollen is 100 µm and its mass is m = 2.5 x 10-10 kg.
C.0.3. Calculate the value of this limiting speed for a grain of corn pollen, given that g = 9.8 m.s-2, that the air viscosity is 1.8x10-5 Pa.s at 25 °C, that the mean radius of a grain of pollen is 100 µm and its mass is m = 2.5 x 10-10 kg.
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We are now going to consider the transport of the grains of pollen in the air. A grain of pollen torn from the stamen by a gust of wind finds itself airborne. It is now in free fall because
it only experiences the force due to its weight and a friction force proportional to its speed
Use the preceding result (C.0.3) to explain why the grains of pollen can stay suspended in the atmosphere for a long time, hence they can spread over large distances under the influence
of the wind, before depositing on the ground and thereby causing allergies.
Transcribed Image Text:C.0.3. Calculate the value of this limiting speed for a grain of corn pollen, given that g
9.8 m.s-2, that the air viscosity is 1.8×10-5 Pa.s at 25 °C, that the mean radius of a grain
of pollen is 100 µm and its mass is m = 2.5 × 10-10 kg.
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