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When a tuning fork (frequency \( 262 \mathrm{~Hz} \) ) is struck, it loses half of its
\( \mathrm{P} \) energy after \( 4 \mathrm{~s} \). The fractional energy loss in a period or in a cycle

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is. (Given \( \left.e^{-1 /(262)(5.77)}=0.99933872\right) \).
(1) \( 6.61 \times 10^{-4} \)
(2) \( 5.51 \times 10^{-4} \)
(3) \( 4.81 \times 10^{-4} \)
(4) \( 3.71 \times 10^{-4} \)
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