The excess pressure inside a soap bubble radius 4 cm is 30 dyne cm -2. The surface tension is

Question

The excess pressure inside a soap bubble radius 4 cm is 30 dyne cm -2. The surface tension is (A) 30 dyne cm -1 (B) 60 dyne cm -1 (C) 15 dyne cm -1 (D) 45 dyne cm -1

Tardigrade Admin · Accepted Answer

Δ p=(4 T/R) for soap bubble 30=(4 × T/4) T =30 dyne cm -1

Q. The excess pressure inside a soap bubble radius $4 c m$ is $30$ dyne $c m^{- 2}$ . The surface tension is

30 dyne $c m^{- 1}$

60 dyne $c m^{- 1}$

15 dyne $c m^{- 1}$

45 dyne $c m^{- 1}$

$Δ p = \frac{4 T}{R}$ for soap bubble
$30 = \frac{4 \times T}{4}$
$T = 30$ dyne $c m^{- 1}$

Q. The excess pressure inside a soap bubble radius 4cm is 30 dyne cm−2. The surface tension is

30 dyne cm−1

60 dyne cm−1

15 dyne cm−1

45 dyne cm−1