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A comment on What Happened in the UK Blackouts?. Parent comment

Re:What Happened in the UK Blackouts? by fanf2 on Sunday September 01, 2019 @07:48AM (#20851775)
The change in pitch from 50Hz to 48.8Hz was 0.4 semitones.

12 * ln 50 / ln 2 = 67.7

12 * ln 48.8 / ln 2 = 67.3

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