Class 12 Physics Acoustic phenomena Notes and Important Questions
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Notes for Class 12 Acoustic phenomena (Physics) are shown above.
Practice
Important Questions
If the source of sound and the listener move in the same direction with same velocity equal to half the velocity of sound, what is the change in frequency?
0%
25%
50%
100%
Which one of the following directly affects the quality of sound?
shape of the source
frequency
intensity
wave form
Which one of the following properties of sound is affected by the change in air temperature?
amplitude
frequency
wavelength
intensity
The frequency of tuning fork is 384 Hz and velocity of sound in air is 352 m/s. How far has the sound travelled while fork completes 36 vibrations?
33 m
36 m
352 m
72 m
If the source of sound and the listener move in the same direction with same velocity equal to half the velocity of sound, what is the change in frequency?
0%
25%
50%
100%
Why and how did Laplace correct Newton's formula for velocity of sound in air?
What is the displacement amplitude for a sound wave having a frequency of 100 Hz and a pressure amplitude of 10 Pa? (Speed of sound in air is 340 m/s and density of air is 1.29 kg/m³)
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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
5
Total Marks
5
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 1 | — |
| 2082 | 1 | — |
| 2081 | 1 | — |
| 2080 | 1 | 1 |
| 2078 | 3 | 4 |
Also appears in 7 model questions (not counted above — model sets aren't actual NEB exam history).
Acoustic Phenomena examines the physical characteristics of sound, such as intensity, loudness, pitch and quality. It also introduces pressure amplitude and explains the Doppler effect and its applications.
This page covers Acoustic phenomena, chapter 9 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 7 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.