A standing wave, consisting of two pure tone waves both having a frequency of 1 kHz and moving in opposite directions along a line, has one wave with an SPL of 90 dB re 20 and the other wave has half the amplitude. What is the smallest and largest SPL a microphone could read of this standing wave?

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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.