What is enharmonically equivalent to F♭?

Question

BlackTom AI · Accepted Answer

Enharmonic equivalents are notes that sound the same pitch but are spelled differently. On a keyboard, E and F are adjacent white keys with no black key between them, so they are a semitone apart. Lowering F by one semitone (F♭) lands on the same key/pitch as E natural.

1) Relevant knowledge points and concepts
- A semitone (half step) is the smallest interval in Western equal temperament.
- E and F are a semitone apart (no black key between them).
- A flat (♭) lowers a note by one semitone; a sharp (♯) raises a note by one semitone.
- Enharmonic equivalence: different spellings can denote the same sounding pitch (e.g., C♯ = D♭).

2) Step-by-step reasoning
- Start with F natural.
- Apply the flat: F♭ = F lowered by one semitone.
- Since E is one semitone below F, F♭ sounds the same as E.

3) Intermediate steps / pitch counting
- F♭ = F − 1 semitone.
- F − 1 semitone = E (because E → up 1 semitone → F).
- Therefore F♭ = E.

4) Why the correct answer is correct
- The interval between E and F is one semitone. Lowering F by a semitone yields E, so F♭ is enharmonically E. This is consistent on the piano and in equal temperament tuning.

5) Why the other choices are incorrect
- E♯: E♯ = E + 1 semitone = F, not F♭. E♯ is enharmonic with F natural, not with F lowered.
- G: G is two semitones above F (or three above E), so it is much higher than F♭/E.
- G♯: G♯ is three semitones above F (or four above E), also not equivalent.

6) Conclusion
F♭ is enharmonically equivalent to E. This matches the provided correct answer: E.

What is enharmonically equivalent to F♭? 单项选择题

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