InterviewSolution
Saved Bookmarks
| 1. |
A pipe closed at one end open at the other end, resonates with sound waves of frequency 135 Hz and also 165 Hz, but not with any wave of frequency intermediate between these two. Then, the frequency of the fundamental note isA. 30 HzB. 15 HzC. 60 HzD. 7.5 Hz |
|
Answer» Correct Answer - b In a closed pipe, resonance frequency, `v= (2r-1)//4l=135 and 165.` The lowest frequency must be highest common factor of 135 and 165, which is 15 Hz. |
|