. Assertion :Water in a U-tube executes SHM, the time period for mercury filled up to the same height in the U-tube be greater than that in case of wate


Reason: Optical fibres are based on phenomenon of total internal reflection.

Best Answer

Solution : The period of the liquid executing SHM in a U-tube does not depend upon the density of the liquid. Therefore, time period will be the same, when mercury is filled up to the same height as the water in the U-tube.

Now, as the pendulum oscillates, it drags air along with it. Therefore, its kinetic energy is dissipated in overcoming viscous drag due to air and hence, its amplitude goes on decreasing.

 

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