Physics
Matter waves are

Electromagnetic waves
Transverse waves
Longitudinal waves
De Broglie waves

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Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
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.

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