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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020

PhysicsEasysingle choice

A soap bubble of radius $r$ is blown up to form a bubble of radius $2 r$ under isothermal conditions. If $σ$ is the surface tension of the soap solution, the energy spent in the process is

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Answer:

Solution:

Energy spent $=$ Work done $=$ $T ∆ A$

Here, $A$ is total surface area

$∴ A = 8 π r^{2}$ for soap bubble

Hence, energy spent $= σ [8 π {(2 r)}^{2} - 8 π r^{2}]$

$= σ (32 π r^{2} - 8 π r^{2})$

$= 24 π σ r^{2}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2020

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