Physics
Transition ions absorb light in :

Infrared region
Ultraviolet region
Visible region
Microwave region

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Physics
A dynamo is used to convert

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

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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 waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.

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