Speeding away from the bank at 95 mph, Kelsey notices that the bank alarm sounded "different" than it had sounded when picking up the money. At that time, it seemed to be 265 Hz. Of course, in the air-conditioned bank the temperature was 68° F and outside it was 94°F. (1 mile = 1.60 km) a) What was the speed of sound in the bank? b) What was the wavelength of the bank alarm inside the bank? c) What was the speed of sound outside the bank? d) Calculate the frequency and wavelength of the alarm sound Kelsey received driving away from the bank.

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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.