1.

For a certain organ pipe , three successive resonance frequencies are observed at 255 Hz, 425Hz, 595Hz respectively, then the pipe isA. A pipe closed at one end with fundamental frequency 85 HzB. Closed at one end with fundamental frequency 255HzC. Open at both the ends with fundamental frequency 85HzD. Open at both the ends with fundamental frequency 255Hz

Answer» Correct Answer - A
`n_3-n_2 = 595 - 425 = 170`
`n_2-n_1 = 425 - 255 = 170`
`n_2 -n_1 = 2n = 170 " " therefore n=85`
`n_2=3n=3xx85=255`
`n_3=5n=5xx85=425`
odd multiples of fundamental frequency


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