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Q. |
The vacuum inside a incandescent lamp is of the order of |
A. | 10-3 mm Hg |
B. | 10-2 mm Hg |
C. | 10-4 mm Hg |
D. | 10-5 mm Hg |
E. | 10-6 mm Hg |
Answer» C. 10-4 mm Hg |
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