Physics
The recoiling of gun is an example of which of the following?

Law of Conservation of Angular Momentum
Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Linear Momentum
Law of Conservation of Energy

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Physics
Planets do not twinkle because

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 emit light of a constant intensity
They are nearer to earth and hence we receive a greater amount of light.

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