Two bulbs X and Y, each filled with air at different pressures, are linked by a tube P that has two mercury threads inside it. The density of mercury is $13600\,\text{kg m}^{-3}$. Which pair of values for $h_1$ and $h_2$ could be correct?
- A$h_1 = 4.0\,\text{cm},\ h_2 = 2.0\,\text{cm}$
- B$h_1 = 6.0\,\text{cm},\ h_2 = 6.0\,\text{cm}$
- C$h_1 = 12.0\,\text{cm},\ h_2 = 18.0\,\text{cm}$
- D$h_1 = 18.0\,\text{cm},\ h_2 = 12.0\,\text{cm}$