Water is filled up to same level in two ...

Water is filled up to same level in two identical flasks at 4° If one (say A) is heated while other (B) is cooled, then (Neglect expansion or contraction of flasks)

Water level in both flask A and 8 will rise

Water level in both flask A and B will fall

Water level will rise in flask A and fall in flask B

Water level will fail in flask A and rise in flask B

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Two small boats are 10m apart on a lake. Each pops up and down with a period of 4.0 seconds due to wave motion on the surface of water. When one boat is at its highest point, the other boat is its lowest point. Both boats are always within a single cycle of the waves. The speed of the waves is:

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