Properties Of Solids And Liquids Question 344
Question: Surface tension of a soap solution is $ 1.9\times {{10}^{-2}}N/m. $ . Work done in blowing a bubble of 2.0 cm diameter will be [MP PMT 1991]
Options:
A) $ 7.6\times {{10}^{-6}}\pi $ joule
B) $ 15.2\times {{10}^{-6}}\pi $ joule
C) $ 1.9\times {{10}^{-6}}\pi $ joule
D) $ 1\times {{10}^{-4}}\pi $ joule
Show Answer
Answer:
Correct Answer: B
Solution:
$ W=8\pi R^{2}T=8\pi \times {{(1\times {{10}^{-2}})}^{2}}\times 1.9\times {{10}^{-2}} $ =$ 15.2\times {{10}^{-6}}\pi J $
