Class 12 Physics Mechanical waves Notes and Important Questions
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Notes for Class 12 Mechanical waves (Physics) are shown above.
Practice
Important Questions
What correction is made by Laplace over the Newton's formula for velocity of sound in a gas? Obtain the corrected formula.
Calculate the wavelength of wave in air at 25°C if the frequency of the wave is 256 Hz and velocity of sound at 0°C is 330 m s⁻¹
i) Write down Newton's formula for the velocity of sound in a gas medium with its discrepancy.
ii) Obtain Laplace's corrected formula.
iii) Explain why sound waves are also called pressure waves.
Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
2
Question Items
0
Total Marks
2
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 1 | — |
| 2082 | 1 | — |
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.
Students learn how mechanical waves travel through different media and how the velocity of sound varies in solids, liquids and gases. The chapter also discusses Laplace's correction and factors affecting sound velocity.
This page covers Mechanical waves, chapter 7 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 2 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.