Physics
The audio signals of TV are

Amplitude modulated
Frequency modulated
Velocity modulated
Unmodulated

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Physics
Siphon will fail to work if:

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

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