Physics · Standards of Measurement
Consider the following statements: 1. The caesium beam and the hydrogen maser are primary or absolute standards. 2. The rubidium vapour standard is based on the hyperfine transition in rubidium-78 gas. 3. The secondary standard of e.m.f. is the unsaturated Weston cell. Which of the above statements are correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11 and 2 only
- 21 and 3 only✓
- 31, 2 and 3
- 42 and 3 only
Correct answer
1 and 3 only
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