1.A rectangular film of liquid is extended from (4 cm×2 cm)(4\,\text{cm} \times 2\,\text{cm})(4cm×2cm) to (5 cm×4 cm)(5\,\text{cm} \times 4\,\text{cm})(5cm×4cm). If the work done is 3×10−4 J3 \times 10^{-4}\,\text{J}3×10−4J, the value of the surface tension of the liquid isa.0.250 N m−10.250\,\text{N}\,\text{m}^{-1}0.250Nm−1b.0.125 N m−10.125\,\text{N}\,\text{m}^{-1}0.125Nm−1c.0.2 N m−10.2\,\text{N}\,\text{m}^{-1}0.2Nm−1d.8.0 N m−18.0\,\text{N}\,\text{m}^{-1}8.0Nm−1Login to continueOnly logged in users canattempt or see the solution.
