Convert **terahertz** to **petahertz**

Selected category: frequency and angular frequency.

Terahertz (THz) is a unit of frequency equal to 10^{12} Hz.

Petahertz (PHz) is a unit of frequency equal to 10^{15} 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.

Swap, do a petahertz to terahertz conversion.