Assertion: atomic clock | /r/HasProperty | based on a 24-ghz transition
Facets:
value: in the ammonia molecule
type: OTHER
Source sentences:
text: The first atomic clock, constructed at the National Bureau of Standards in 1949, was based on a 24-GHz transition in the ammonia molecule.
text: The first atomic clock, constructed at the National Bureau of Standards in 1949, was based on a 24-GHz transition in the ammonia molecule.