Physics
Woollen cloth protects the body from cold because

It reflects heat
It is a poor conductor of heat
External heat rays enter into the body through the woollen cloth
It is a good conductor of heat

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

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

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