Physics
Siphon will fail to work if:

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

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
The speed of the wave is zero or near zero
Two waves overlap
A wave reflects upon itself

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