1/3. Name elements of vacuum equipment (move nameplates to the corresponding elements).
2/3. Number stages of vacuum system assembly (connect stages with corresponding numbers).
3/3. The source of alpha particles with energy 6 MeV is placed inside a vacuum chamber. The distance between the source and the detector is 1 meter. The plot below displays dependence of alpha particle energy on air pressure in the chamber. Using the plot define the maximum pressure at which alpha particles will reach the detector.