A stationary source generates \( 5.0 \mathrm{~Hz} \) water waves whose speed is \( 2.0 \mathrm{~...

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A stationary source generates \( 5.0 \mathrm{~Hz} \) water waves whose speed is \( 2.0 \mathrm{~m} / \mathrm{s} \). A boat is approaching the source at \( 10 \mathrm{~m} / \mathrm{s} \). The frequency of these waves, as observed by a person in the boat, is
(A) \( 25 \mathrm{~Hz} \)
(B) \( 20 \mathrm{~Hz} \)
(C) \( 15 \mathrm{~Hz} \)
(D) \( 30 \mathrm{~Hz} \)
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