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Important Questions

Wave Motion — Important Questions

ICSE · Class 11 · Physics

60 important questions from Wave Motion for ICSE Class 11 Physics, with answers. Includes multiple choice and multiple correct questions.

60 questions38 flashcards15 formulas & key relations5 concepts

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A comparison showing the key differences between mechanical waves (requiring a medium, e.g., sound, water waves) and electromagnetic waves (not requiring a medium, e.g., light, radio waves). Include e
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60 Questions·
multiple choicemultiple correct

Important Questions from Wave Motion

1multiple choice
3 marks

At 0°C, sound travels at 331 m/s. Estimate the speed at 30°C using v = 331 + 0.61t.

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349.3 m/s

Substitute t = 30°C in v = 331 + 0.61t. So v = 331 + 0.61 × 30 = 331 + 18.3 = 349.3 m/s.

2multiple choice
3 marks

A sound wave travels through air at 344 m/s. If the speed is proportional to the square root of absolute temperature, and the speed at 0°C is 331 m/s, find the approximate temperature in °C.

Show answer

21 °C

Use v_t = 331(1 + t/(2×273)). So 344 = 331(1 + t/546). Divide by 331: 344/331 ≈ 1.0393. Hence t/546 ≈ 0.0393, so t ≈ 21.5 °C, about 21°C.

3multiple choice
3 marks

The speed of sound in air at 0°C is 331 m/s. Find the speed at 50°C using the approximate formula v = 331 + 0.61t.

Show answer

361.5 m/s

v = 331 + 0.61 × 50 = 331 + 30.5 = 361.5 m/s.

4multiple choice
3 marks

Sound is travelling in air where the wind speed along the direction of sound is 6 m/s and the actual sound speed is 331 m/s. Find the resultant speed of sound along that direction.

Show answer

337 m/s

When wind blows along the direction of sound, speeds add. So resultant speed = 331 + 6 = 337 m/s.

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Frequently Asked Questions

What are the important topics in Wave Motion for ICSE Class 11 Physics?
Key topics in Wave Motion include Mechanical Waves and Basic Ideas, Speed of Wave Motion in Solids, Liquids and Strings, Newton’s Formula and Laplace’s Correction, Variation of Speed of Sound in Air. Study these first, then practise questions on each for Class 11 exams.
How many important questions are there in Wave Motion?
Super Tutor has 60 practice questions for Wave Motion, including multiple choice, multiple correct questions. A sample with answers is on this page.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 11 Physics Important Questions

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