18. The tension in a guitar string is decreased by 19%. Compared to the string oscillating in its 1st harmonic before, the new 1st harmonic wavelength and the 1st harmonic 9; frequency a) decreases by 10%, remains the same b) decreases by 10%, c) decreases by 21%, d) remains the same, e) remains the same, decreases by 10% remains the same remains the same decreases by 10% I

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Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.