Water Rises To A Height Of 13.6 Cm In A Capillary Tube Dipped In Water. When The Same Tube Is Dipped In Mercury, It Is Depressed By  cm. The Angle Of Contact For Water Is Zero And That For Mercury 135o. The Relative Density Of Mercury Is 13.6. The Ratio Of The Surface Tensions Of Mercury And Water Is   

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Question

Water rises to a height of 13.6 cm in a capillary tube dipped in water. When the same tube is dipped in mercury, it is depressed by  cm. The angle of contact for water is zero and that for mercury 135o. The relative density of mercury is 13.6. The ratio of the surface tensions of mercury and water is   

Solution

Correct option is

6

 

We know that  

        

Given, 

.  

Substituting these values, we get .

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