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Physics -- Sound
11.
A cylindrical resonance tube, open at both ends, has a fundamental frequency F in air. Half of the length of the tube is
dipped vertically in water. The fundamental frequency of the air column now is
- A.4F
- B.2F
- C.F
- D.F/2
- Answer
- Report
Answer : [C]
12.
An open pipe is suddenly closed at one end, as a result of which he frequency of the third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency of the open pipe is
- A.200 Hz
- B.300 Hz
- C.240 Hz
- D.480 Hz
- Answer
- Report
Answer : [A]
13.
The third overtone of an open organ pipe of length lo has the same frequency as the third overtone of a closed pipe of length lc. The ratio lo / lc is equal to
- A.2
- B.3/2
- C.5/3
- D.8/7
- Answer
- Report
Answer : [D]
14.
A pipe of length 1 m is closed at one end. The velocity of sound in air is 300 m/s. The air column in the pipe will not resonate for sound of frequency
- A.75 Hz
- B.225 Hz
- C.300 Hz
- D.375 Hz
- Answer
- Report
Answer : [C]
15.
Two closed organ pipes, A and B, have the same length. A is wider than B. They resonate in the fundamental mode at
frequencies nA and nB respectively.
- A.nA = nB
- B.nA < nB
- C.nA > nB
- D.Either (b) or (c) depending on the ratio of their diameters.
- Answer
- Report
Answer : [C]
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