A section of drainage culvert 1.23 m in length makes a howling noise when the wind blows. What is the 5th lowest natural frequencies of the culvert if it is blocked at one end? Temperature of air is 38 C. 361 Hz 721 Hz 1298 Hz
A section of drainage culvert 1.23 m in length makes a howling noise when the wind blows. What is the 5th lowest natural frequencies of the culvert if it is blocked at one end? Temperature of air is 38 C. 361 Hz 721 Hz 1298 Hz
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Transcribed Image Text:A section of drainage culvert 1.23 m in length makes a howling noise when the wind blows. What is the 5th lowest natural
frequencies of the culvert if it is blocked at one end? Temperature of air is 38 C.
361 Hz
721 Hz
1298 Hz
649 Hz
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