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Two soap bubbles each with radius \( r_{1} \) and \( r_{2} \) coalesce in vacuum under isothermal conditions to form a bigger bubble of radius \( R \). Then \( R \) is equal to
(a) \( \sqrt{r_{1}^{2}+r_{2}^{2}} \)
(b) \( \sqrt{r_{1}^{2}-r_{2}^{2}} \)
(c) \( r_{1}-r_{2} \)
(d) \( \frac{\sqrt{r_{1}^{2}+r_{2}^{2}}}{2} \)
\( \mathrm{P} \)
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