Fundamentholfundamenthol
NEET2022Physics
Q.

If a soap bubble expands, the pressure inside the bubble :

  1. A

    increases

  2. B

    remains the same

  3. C

    is equal to the atmospheric pressure

  4. D

    decreases

Solution

Excess pressure inside a soap bubble: , where is surface tension and is the bubble's radius.

As the bubble expands, increases, so the term decreases and the inside pressure decreases.

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