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

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

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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