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9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement
  • ✓
    Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble
  • B
    Pressure of the larger bubble is higher than the smaller bubble
  • C
    Both bubbles have the same internal pressure
  • D
    None of the above
✓

Answer

Correct option: A.
Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble
a
(a) $\Delta \,P = \frac{{4T}}{R}$

$\Delta P \propto \frac{1}{R}$ ($T$ = constant)

Hence, the internal pressure of smaller bubble is larger than that of larger bubble.

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