Physics
What is unit of Viscosity ?

Newton second per square meter
Watt per meter per degree celcius
Coulomb
Joule per kilogram per Kelvin

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Physics
Planets do not twinkle because

They emit light of a constant intensity
Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.

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