Question 11

Two sources, A and B, excite the 2nd natural mode of vibration (i.e. the first overtone) in two air columns of the same length, but A's column is closed at one end and B's column is open at both ends. The ratio of A's frequency to B's frequency is

• A.    1:2
• B.    3:4
• C.    4:3
• D.    2:5
• E.    2:1

Formula Sheet

Question 10

Question 12

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