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KVPY2014PhysicsMechanical Properties of Fluids

A machine is blowing spherical soap bubbles of different raddi filled with helium gas. It is found that if the bubbles have a radius smaller than 1 ~cm , then they sink to the floor in still air. Larger bubbles float in the air. Assume that the thickness of the soap film in all bubbles is uniform and equal. Assume that the density of soap solution is same as that of water (=1000 kgm ⁻³ ) . The density of helium insid

Options

  1. A0.50 m
  2. B1.50 m
  3. C7.00 m
  4. D3.50 m

Correct answer

D. 3.50 m

Step-by-step solution

Weight =F₀4 r² t _ w g+4 / 3 r³ _ N e g=4 / 3 r³ _ air g t=3.5 um

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