Up-and-coming energy source

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Possible Answers: SOL.

Last seen on: Newsday.com Crossword – Apr 2 2021

Random information on the term “SOL”:

Sol, so, or G is the fifth note of the fixed-do solfège starting on C. As such it is the dominant, a perfect fifth above C or perfect fourth below C.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle G (G4) note is approximately 391.995 Hz. See pitch for a discussion of historical variations in frequency.

It has enharmonic equivalents of F (a diatonic semitone below G♯) and A (a diatonic semitone above G♭).

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SOL on Wikipedia