Which of the following expressions represents the excess of pressure inside the soap bubble?
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A drop of liquid pf density is floating half immersed in a liquid of density and surface tension . The radius of drop in will be : (Take : )
As liquid drop is in equilibrium.
So
Boyant force + surface tension
The work done in increasing the size of a soap film from to is . The surface tension of the film is
Work done, (Change in area)
there are two free surface
Surface tension,
A mercury drop of radius is sprayed into drops of equal size. The energy expressed in joule is (surface tension of Mercury is )
0.057
5.7
Work done in increasing the size of a soap bubble from radius to is nearly (surface tension of soap solution )
Work done Change in surface energy
Two small drops of mercury each of radius coalesce to form a single large drop. The ratio of total surface energy before and after the change is :
As volume remain same i.e volume of two smaller drops will be equal to volume of one big drop.
An isolated and charged spherical soap bubble has a radius and the pressure inside is atmospheric. If is the surface tension of soap solution, then charge on drop is then find the value of .
8
+9
7
2
Inside pressure must be greater than outside pressure in bubble.
This excess pressure is provided by charge on bubble.
A glass tube of uniform internal radius has a valve separating the two identical ends. Initially, the valve is in a tightly closed position. End 1 has a hemispherical soap bubble of radius . End 2 has sub-hemispherical soap bubble as shown in figure. Just after opening the valve
air from end 1 flows towards end 2. No change in the volume of the soap bubbles
air from end 1 flows towards end 2. Volume of the soap bubble at end 1 decreases
no change occurs
air from end 2 flows towards end 1. Volume of the soap bubble at end 1 increases
Pressure inside tube
(since )
Hence pressure on side 1 will be greater than side 2. So air from end 1 flows towards end 2
Subhemispherical Hemispherical
The lower end of a capillary tube of radius is placed vertically in water. Then, with the rise of water in the capilllary, heat evolved is:
radius radius
A glass capillary tube of inner diameter is lowered vertically into water in a vessel. The pressure to be applied on the water in the tube so that water level in the tube is same as that in the vessel in is (surface tension of water , atmospheric pressure )
Pressure applied,
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