Selected category: frequency and angular frequency.
Selected initial unit : petahertz.
Definition and details for petahertz:
Petahertz (PHz) is a unit of frequency equal to 1015 Hz. For example 2.47 PHz is the frequency of Lyman-alpha line, a spectral line of hydrogen, which is emitted when the electron falls from the n = 2 orbital to the n = 1 orbital.
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