A concert is held inside a well-insulated hall. The concert hall is a half of a hemispherical shaped dome with the stage at the center of the hemisphere. Within the hall, the sound level is 123 dB. The sound can be heard outside the building because of the open windows, which have a total area of Awindows = 17.0 m². (Assume no sound is transmitted through the walls of the building, and that the sound waves are perpendicular to the windows.) (a) How much sound energy (in J) is radiated in t = 26.0 min? 52907.4 (b) If none of the sound emitted from the windows is absorbed and we assume it radiates uniformly in all directions, at a distance of d = 2.8 km away (which is large compared to the size of the building), determine the sound level in dB. 55.37 X Assume the sound power covers the area of a hemisphere with radius 2.8 km. Find the intensity as a function of power, then use your result to calculate the sound intensity level. dB

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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.