Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
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.

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Physics
A standing wave occurs when

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

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