Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.

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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 wave broadcasts are made by nearby radio stations.
Short waves are unaffected by atmospheric disturbances.

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