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

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The initial momentum of the rubber ball is greater than that of the metal ball
Both suffer the same change in momentum
The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

The material of which pipes are made contracts due to cold and so breaks
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break
None of these

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