Physics
A dynamo is used to convert

Magnetic energy into mechanical energy
Electrical energy into magnetic energy
Electrical energy into mechanical energy
Mechanical energy into electrical energy

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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 more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.

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