[QUE/TH-02010] TH-PROBLEM

The $U$-tube in Fig.-1 below, of uniform cross section 1 cm$^2$, contains mercury to the depth shown. The barometric pressure is 750 Torr. The left side of the tube is now closed at the top, and the right side in connected to a good vacuum pump. Assuming that the temperature remains constant answer the following questions.

1. How far does the mercury level fall in the left side?
2. What is final pressure of the trapped air?