trustme.bro/r/…
✓ checked
trust me, bro:
here is the receipt.
the claim
The SI second is defined by hyperfine atomic transition oscillations
the verdict
SUPPORTED
the evidence backs this
confidence 83/100

The SI second is officially defined by the hyperfine transition frequency of the cesium-133 atom.

Evidence for · 2
Towards the optical second: verifying optical clocks at the SI limit.
2019 · cited by 16
This paper notes that the current SI definition of the second is based on the microwave hyperfine transition in 133Cs.
See more details
More for · 1
Search for Ultralight Dark Matter from Long-Term Frequency Comparisons of Optical and Microwave Atomic Clocks.
2022 · cited by 12
This paper discusses frequency comparisons involving 133Cs fountain microwave clocks in the context of the SI second definition.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8301 Aug 2026
This receipt carries no identity, shared or not. Sharing publishes your connection to it, not your data.
Check your own claim
Challenge the receipt
trust me, bro: win the argument, pass the class, survive peer review.
This receipt is an automated verdict against our published method · not an opinion about any author or publication.
Terms · Privacy · How verdicts work · Dispute this receipt