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प्रश्न
Define the surface energy of the liquid.
उत्तर
The potential energy is greater for molecules at the surface film as compared to molecules well inside the liquid. This extra energy of the molecule on the surface layer of a liquid is called the surface energy of the liquid.
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संबंधित प्रश्न
Derive the relation between surface tension and surface energy per unit area.
Energy needed in breaking a drop of radius R into n drops each of radius r is given by ____________.
Assertion: If work done in increasing the size of a soap film from 10 cm x 4 cm to 10 cm x 8 cm is 2 x 10-4 J, then the surface tension is 5 x 10-4 N m-1.
Reason: Work done = Surface tension x increase in area.
Which one of the following statements is correct?
A metal wire of density 'p' floats on water surface horizontally. If it is NOT to sink in water then maximum radius of wire is proportional to ______.
(T = surface tension of water, g = gravitational acceleration)
Two spherical soap bubbles of radii r1 and r2 in vacuum coalesce under isothermal conditions. The resulting bubble has a radius R such that ____________.
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The surface energy of a liquid drop is u. If it is sprayed into 1000 equal droplets, then its surface energy becomes ______.
If a million tiny droplets of water of the same radius coalesce into one larger drop, then the ratio of the surface energy of the large drop to the total surface energy of all the droplets will be ____________.
A fix number of spherical drops of a liquid of radius 'r' coalesce to form a large drop of radius 'R' and volume 'V'. If 'T' is the surface tension then energy ______.
A water film is formed between the two straight parallel wires, each of length 10 cm, kept at a separation of 0.5 cm. Now, the separation between them is increased by 1 mm without breaking the water film. The work done for this is ______.
(surface tension of water = 7.2 x 10-2Nm-1)
A metal coin of thickness 'd' and density 'ρ' is floating on water of surface tension 'T'. The radius of the coin is ______.
g = acceleration due to gravity
One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is ______.
The surface tension of a liquid is 10 N/m. If a thin film of the area 0.05 m2 is formed on a loop. Then the surface energy will be:
A water drop of diameter 2 cm is broken into 64 equal droplets. The surface tension of water is 0.075 N/m. In this process the gain in surface energy will be ______.
A big water drop is formed by the combination of 'n' small water drops of equal radii. The ratio of the surface energy of 'n 'drops to the surface energy of big drop is ______.
Calculate the work done in blowing a soap bubble to a radius of 1 cm. The surface tension of soap solution is 2.5 × 10-2 N/m.
If T1, T2 and T3 are the forces due to surface tension at the liquid-s solid-gas and liquid-gas interfaces such that T2 - T1 ≅ T3 and the contact angle for the liquid-solid pair is θ then ______.
Prove that, equivalent S.I. unit of surface tension is J/m2.
Calculate the amount of energy evolved when 343 droplets of mercury each of radius. 0.05 mm, combine to form one drop. The surface tension of mercury is 50 x 10-2 N/m.
