Two tuning forks when sounded simultaneously give one beat each \( 0.4 \) second. What is the di...

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Two tuning forks when sounded simultaneously give one beat each \( 0.4 \) second. What is the difference of the frequencies?
\( P \)
(A) \( 1 \mathrm{~Hz} \)
(B) \( 1.5 \mathrm{~Hz} \)
(C) \( 2 \mathrm{~Hz} \)
(D) \( 2.5 \mathrm{~Hz} \).
W.
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