Class 12 Physics Waves in pipes and strings Notes and Important Questions
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Notes for Class 12 Waves in pipes and strings (Physics) are shown above.
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Important Questions
When the wire of a sonometer is $75\ \text{cm}$ long, it is in resonance with a tuning fork. On shortening the wire by $0.5\ \text{cm}$ it makes 3 beats with the same fork. The beat is the difference in frequencies. Calculate the frequency of the tuning fork.
The diagram below shows an experiment to measure the speed of a sound in a string. The frequency of the vibrator is $120\ \text{Hz}$. Calculate the speed at which a progressive wave would travel along the string.
The fundamental frequency for a particular organ pipe is 330 Hz. The pipe is closed at one end but open at the other. What is the frequency of its second mode?
110 Hz
165 Hz
660 Hz
990 Hz
The given figure shows the first overtone of a stretched string of length l.
i) Define harmonics and overtone.
ii) Calculate the frequency of this mode.
iii) If the tension of the string is increased 4 times, what will be the frequency of this mode?
The given figure shows the first overtone of a stretched string of length l
Define harmonics and overtone
Calculate the frequency of this mode.
If the tension of the string is increased 4 times, what will be the frequency of this mode?
Two organ pipes are used to create a musical piece. An open pipe produces its first harmonic, while a closed pipe produces its first overtone. Both pipes produce the same note. What is the relationship between the lengths of the two pipes?
Define end correction
Describe different modes of vibration in a stretched string.
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Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
7
Question Items
2
Total Marks
4
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 3 | — |
| 2082 | 2 | — |
| 2081 | 1 | — |
| 2078 | 1 | 2 |
Also appears in 3 model questions (not counted above — model sets aren't actual NEB exam history).
Offered as one of multiple alternative ("OR") questions in 1 past paper — not counted above, since a different chapter's question could be chosen instead.
This chapter explains the formation of stationary waves in air columns and stretched strings. Topics include open and closed pipes, harmonics, overtones, end correction and the laws governing vibrating strings.
This page covers Waves in pipes and strings, chapter 8 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 5 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.