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

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

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Physics
Pressure Cooker cooks faster because

The material of the cooker is a good conductor
Higher temperature is attained for cooking
It cooks the food at low pressure
Boiling point decreases with rise of pressure

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