The surface tension of a liquid is 5 N / m. If a film is held on a ring of area 0.02 m^2, its

step 1 It is given that surface tension surface tension t is equal to 5 Newton per meter and a ring are

The surface tension of a liquid is 5 N / m. If a film is...

The surface tension of a liquid is $5 \mathrm{~N} / \mathrm{m}$. If a film is held on a ring of area $0.02 \mathrm{~m}^{2}$, its total surface energy is about (A) $5 \times 10^{-2} \mathrm{~J}$ (B) $2.5 \times 10^{-2} \mathrm{~J}$ (C) $2 \times 10^{-1} \mathrm{~J}$ (D) $3 \times 10^{-1} \mathrm{~J}$

The surface tension of a liquid is $5 \mathrm{~N} / \mathrm{m}$. If a film is held on a ring of area $0.02 \mathrm{~m}^{2}$, its total surface energy is about
(A) $5 \times 10^{-2} \mathrm{~J}$
(B) $2.5 \times 10^{-2} \mathrm{~J}$
(C) $2 \times 10^{-1} \mathrm{~J}$
(D) $3 \times 10^{-1} \mathrm{~J}$

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Key Concepts

Double-Sided Films

Double-sided films, such as soap films, have two surfaces exposed to air, meaning that the energy associated with both sides contributes to the total surface energy. When calculating the surface energy for a film, one must consider that both sides of the film contribute, effectively doubling the energy calculation compared to a single interface.

Surface Energy

Surface energy is the total energy associated with the surface of a liquid and is calculated by multiplying the surface tension by the area of the surface. This energy represents the work required to create a new surface. In problems involving films or interfaces, understanding surface energy is crucial for determining the work or energy involved when altering the surface area.

Surface Tension

Surface tension is a property of a liquid that describes the elastic tendency of its surface. It is defined as the energy per unit area or the force per unit length acting along the surface of the liquid, usually measured in newtons per meter or joules per square meter. This concept is fundamental when explaining how the surface of a liquid behaves and how it minimizes its area.

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