Beat frequency
Two tuning forks with frequencies of 440 Hz and 444 Hz are struck together. What beat frequency is heard?
Answer B: explanation for every choice
A
This halves the difference.
B
Correct. The beat frequency is the difference: |444 − 440| = 4 Hz.
C
442 Hz is the average, which is the perceived pitch, not the beat frequency.
D
This adds the two frequencies.
TakeawayBeat frequency = |f₁ − f₂|.
Equation usedBeat frequency
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