Waves - Result Question 52
54. A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has
[1991]
(a) three nodes and three antinodes
(b) three nodes and four antinodes
(c) four nodes and three antinodes
(d) four nodes and four antinodes
Topic 3: Beats, Interference & Superposition of Waves
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Answer:
Correct Answer: 54. (d)
Solution:
- (d) Third overtone has a frequency $7 n$, which means $L=\frac{7 \lambda}{4}=$ three full loops + one half loop, which would make four nodes and four antinodes.
