MCQOPTIONS
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MCQOPTIONS
| 1. |
Which of the following is the ideal vacuum for electron spectrometers? |
| A. | 10<sup>-6</sup> torr |
| B. | 10<sup>-7</sup> torr |
| C. | 10<sup>-8</sup> torr |
| D. | 10<sup>-9</sup> torr |
| Answer» B. 10<sup>-7</sup> torr | |