Physics
Planets do not twinkle because

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

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Physics
'Mirage' is an example of

Refraction of light only
Total internal reflection of light only
Dispersion of light only
Refraction and total internal reflection of light

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short wave broadcasts are made by nearby radio stations.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.

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